Is 21 a factor of 687?

Here we will show you two different methods you can use to determine if 21 is a factor of 687.

The first method entails simply listing all factors of 687 and then seeing if 21 is one of them. The factors of 687 are 1, 3, 229, and 687. Looking at the list, you see that 21 is not on the list, and the answer to "Is 21 a factor of 687?" is therefore no.

For the second and perhaps easier method, we divide 687 by 21 to see if the quotient is a whole number or fractional number. If the quotient is a whole number, then 21 is a factor of 687. If the quotient is a fractional number, then 21 is not a factor of 687.

687 divided by 21 is 32.71428571 which is a fractional number. Thus, once again, the answer to "Is 21 a factor of 687?" is no.

Factor Checker
Need to do another factor check? No problem! You are welcome to submit a similar problem below.

Is 21 a factor of 688?
Now you know that 21 is not a factor of 687. Here is the next problem on our list that our Factor Checker explained and solved.