Is 243 divisible by 21?

243 is divisible by 21 if the quotient of 243 divided by 21 is an integer. The quotient is the result you get when you divide one number by another. Furthermore, an integer is a whole number (not a fractional number).

Thus, to find out if 243 is divisible by 21, we simply calculate 243 divided by 21 and then determine if the answer (quotient) is an integer (whole number) or a fractional number.

243 / 21 = 11.57142857

As you can see above, the quotient of 243 divided by 21 is 11.57142857 and 11.57142857 is a fractional number. Therefore, 243 is not divisible by 21.

Q: Is 243 divisible by 21?
A: No

So now you know that 243 is not divisible by 21. Do you want to know all the numbers that 243 is divisible by? No problem. 243 is divisible by 1, 3, 9, 27, 81, and 243.

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