If the square root of a number is an integer, then the number is a perfect square. Here is a list of the first 1000 perfect squares:
√1
√4
√9
√16
√25
√36
√49
√64
√81
√100
√121
√144
√169
√196
√225
√256
√289
√324
√361
√400
√441
√484
√529
√576
√625
√676
√729
√784
√841
√900
√961
√1024
√1089
√1156
√1225
√1296
√1369
√1444
√1521
√1600
√1681
√1764
√1849
√1936
√2025
√2116
√2209
√2304
√2401
√2500
√2601
√2704
√2809
√2916
√3025
√3136
√3249
√3364
√3481
√3600
√3721
√3844
√3969
√4096
√4225
√4356
√4489
√4624
√4761
√4900
√5041
√5184
√5329
√5476
√5625
√5776
√5929
√6084
√6241
√6400
√6561
√6724
√6889
√7056
√7225
√7396
√7569
√7744
√7921
√8100
√8281
√8464
√8649
√8836
√9025
√9216
√9409
√9604
√9801
√10000
√10201
√10404
√10609
√10816
√11025
√11236
√11449
√11664
√11881
√12100
√12321
√12544
√12769
√12996
√13225
√13456
√13689
√13924
√14161
√14400
√14641
√14884
√15129
√15376
√15625
√15876
√16129
√16384
√16641
√16900
√17161
√17424
√17689
√17956
√18225
√18496
√18769
√19044
√19321
√19600
√19881
√20164
√20449
√20736
√21025
√21316
√21609
√21904
√22201
√22500
√22801
√23104
√23409
√23716
√24025
√24336
√24649
√24964
√25281
√25600
√25921
√26244
√26569
√26896
√27225
√27556
√27889
√28224
√28561
√28900
√29241
√29584
√29929
√30276
√30625
√30976
√31329
√31684
√32041
√32400
√32761
√33124
√33489
√33856
√34225
√34596
√34969
√35344
√35721
√36100
√36481
√36864
√37249
√37636
√38025
√38416
√38809
√39204
√39601
√40000
√40401
√40804
√41209
√41616
√42025
√42436
√42849
√43264
√43681
√44100
√44521
√44944
√45369
√45796
√46225
√46656
√47089
√47524
√47961
√48400
√48841
√49284
√49729
√50176
√50625
√51076
√51529
√51984
√52441
√52900
√53361
√53824
√54289
√54756
√55225
√55696
√56169
√56644
√57121
√57600
√58081
√58564
√59049
√59536
√60025
√60516
√61009
√61504
√62001
√62500
√63001
√63504
√64009
√64516
√65025
√65536
√66049
√66564
√67081
√67600
√68121
√68644
√69169
√69696
√70225
√70756
√71289
√71824
√72361
√72900
√73441
√73984
√74529
√75076
√75625
√76176
√76729
√77284
√77841
√78400
√78961
√79524
√80089
√80656
√81225
√81796
√82369
√82944
√83521
√84100
√84681
√85264
√85849
√86436
√87025
√87616
√88209
√88804
√89401
√90000
√90601
√91204
√91809
√92416
√93025
√93636
√94249
√94864
√95481
√96100
√96721
√97344
√97969
√98596
√99225
√99856
√100489
√101124
√101761
√102400
√103041
√103684
√104329
√104976
√105625
√106276
√106929
√107584
√108241
√108900
√109561
√110224
√110889
√111556
√112225
√112896
√113569
√114244
√114921
√115600
√116281
√116964
√117649
√118336
√119025
√119716
√120409
√121104
√121801
√122500
√123201
√123904
√124609
√125316
√126025
√126736
√127449
√128164
√128881
√129600
√130321
√131044
√131769
√132496
√133225
√133956
√134689
√135424
√136161
√136900
√137641
√138384
√139129
√139876
√140625
√141376
√142129
√142884
√143641
√144400
√145161
√145924
√146689
√147456
√148225
√148996
√149769
√150544
√151321
√152100
√152881
√153664
√154449
√155236
√156025
√156816
√157609
√158404
√159201
√160000
√160801
√161604
√162409
√163216
√164025
√164836
√165649
√166464
√167281
√168100
√168921
√169744
√170569
√171396
√172225
√173056
√173889
√174724
√175561
√176400
√177241
√178084
√178929
√179776
√180625
√181476
√182329
√183184
√184041
√184900
√185761
√186624
√187489
√188356
√189225
√190096
√190969
√191844
√192721
√193600
√194481
√195364
√196249
√197136
√198025
√198916
√199809
√200704
√201601
√202500
√203401
√204304
√205209
√206116
√207025
√207936
√208849
√209764
√210681
√211600
√212521
√213444
√214369
√215296
√216225
√217156
√218089
√219024
√219961
√220900
√221841
√222784
√223729
√224676
√225625
√226576
√227529
√228484
√229441
√230400
√231361
√232324
√233289
√234256
√235225
√236196
√237169
√238144
√239121
√240100
√241081
√242064
√243049
√244036
√245025
√246016
√247009
√248004
√249001
√250000
√251001
√252004
√253009
√254016
√255025
√256036
√257049
√258064
√259081
√260100
√261121
√262144
√263169
√264196
√265225
√266256
√267289
√268324
√269361
√270400
√271441
√272484
√273529
√274576
√275625
√276676
√277729
√278784
√279841
√280900
√281961
√283024
√284089
√285156
√286225
√287296
√288369
√289444
√290521
√291600
√292681
√293764
√294849
√295936
√297025
√298116
√299209
√300304
√301401
√302500
√303601
√304704
√305809
√306916
√308025
√309136
√310249
√311364
√312481
√313600
√314721
√315844
√316969
√318096
√319225
√320356
√321489
√322624
√323761
√324900
√326041
√327184
√328329
√329476
√330625
√331776
√332929
√334084
√335241
√336400
√337561
√338724
√339889
√341056
√342225
√343396
√344569
√345744
√346921
√348100
√349281
√350464
√351649
√352836
√354025
√355216
√356409
√357604
√358801
√360000
√361201
√362404
√363609
√364816
√366025
√367236
√368449
√369664
√370881
√372100
√373321
√374544
√375769
√376996
√378225
√379456
√380689
√381924
√383161
√384400
√385641
√386884
√388129
√389376
√390625
√391876
√393129
√394384
√395641
√396900
√398161
√399424
√400689
√401956
√403225
√404496
√405769
√407044
√408321
√409600
√410881
√412164
√413449
√414736
√416025
√417316
√418609
√419904
√421201
√422500
√423801
√425104
√426409
√427716
√429025
√430336
√431649
√432964
√434281
√435600
√436921
√438244
√439569
√440896
√442225
√443556
√444889
√446224
√447561
√448900
√450241
√451584
√452929
√454276
√455625
√456976
√458329
√459684
√461041
√462400
√463761
√465124
√466489
√467856
√469225
√470596
√471969
√473344
√474721
√476100
√477481
√478864
√480249
√481636
√483025
√484416
√485809
√487204
√488601
√490000
√491401
√492804
√494209
√495616
√497025
√498436
√499849
√501264
√502681
√504100
√505521
√506944
√508369
√509796
√511225
√512656
√514089
√515524
√516961
√518400
√519841
√521284
√522729
√524176
√525625
√527076
√528529
√529984
√531441
√532900
√534361
√535824
√537289
√538756
√540225
√541696
√543169
√544644
√546121
√547600
√549081
√550564
√552049
√553536
√555025
√556516
√558009
√559504
√561001
√562500
√564001
√565504
√567009
√568516
√570025
√571536
√573049
√574564
√576081
√577600
√579121
√580644
√582169
√583696
√585225
√586756
√588289
√589824
√591361
√592900
√594441
√595984
√597529
√599076
√600625
√602176
√603729
√605284
√606841
√608400
√609961
√611524
√613089
√614656
√616225
√617796
√619369
√620944
√622521
√624100
√625681
√627264
√628849
√630436
√632025
√633616
√635209
√636804
√638401
√640000
√641601
√643204
√644809
√646416
√648025
√649636
√651249
√652864
√654481
√656100
√657721
√659344
√660969
√662596
√664225
√665856
√667489
√669124
√670761
√672400
√674041
√675684
√677329
√678976
√680625
√682276
√683929
√685584
√687241
√688900
√690561
√692224
√693889
√695556
√697225
√698896
√700569
√702244
√703921
√705600
√707281
√708964
√710649
√712336
√714025
√715716
√717409
√719104
√720801
√722500
√724201
√725904
√727609
√729316
√731025
√732736
√734449
√736164
√737881
√739600
√741321
√743044
√744769
√746496
√748225
√749956
√751689
√753424
√755161
√756900
√758641
√760384
√762129
√763876
√765625
√767376
√769129
√770884
√772641
√774400
√776161
√777924
√779689
√781456
√783225
√784996
√786769
√788544
√790321
√792100
√793881
√795664
√797449
√799236
√801025
√802816
√804609
√806404
√808201
√810000
√811801
√813604
√815409
√817216
√819025
√820836
√822649
√824464
√826281
√828100
√829921
√831744
√833569
√835396
√837225
√839056
√840889
√842724
√844561
√846400
√848241
√850084
√851929
√853776
√855625
√857476
√859329
√861184
√863041
√864900
√866761
√868624
√870489
√872356
√874225
√876096
√877969
√879844
√881721
√883600
√885481
√887364
√889249
√891136
√893025
√894916
√896809
√898704
√900601
√902500
√904401
√906304
√908209
√910116
√912025
√913936
√915849
√917764
√919681
√921600
√923521
√925444
√927369
√929296
√931225
√933156
√935089
√937024
√938961
√940900
√942841
√944784
√946729
√948676
√950625
√952576
√954529
√956484
√958441
√960400
√962361
√964324
√966289
√968256
√970225
√972196
√974169
√976144
√978121
√980100
√982081
√984064
√986049
√988036
√990025
√992016
√994009
√996004
√998001
√1000000
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