Is 4 a factor of 21?

Here we will show you two different methods you can use to determine if 4 is a factor of 21.

The first method entails simply listing all factors of 21 and then seeing if 4 is one of them. The factors of 21 are 1, 3, 7, and 21. Looking at the list, you see that 4 is not on the list, and the answer to "Is 4 a factor of 21?" is therefore no.

For the second and perhaps easier method, we divide 21 by 4 to see if the quotient is a whole number or fractional number. If the quotient is a whole number, then 4 is a factor of 21. If the quotient is a fractional number, then 4 is not a factor of 21.

21 divided by 4 is 5.25 which is a fractional number. Thus, once again, the answer to "Is 4 a factor of 21?" is no.

Factor Checker
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