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Is 15 prime or composite?


To determine if 15 is a prime number or a composite number, we simply look at the factors for 15.

If the factors of 15 are only 15 and 1, then we know that 15 is a prime number. Otherwise, 15 is a composite number.

To explain better, if 15 is only divisible by 1 and 15, then it is a prime number, and if 15 is divisible by more than 15 and 1, then it is a composite number.

The factors of 15 are as follows:

1, 3, 5, 15

Therefore, since 15 is divisible by more than one and itself, the answer to the question "Is 15 prime or composite?" is highlighted in blue below.

composite


Is 16 prime or composite?
OK. Now you know that 15 is a composite number. Use our logic above and see if you can figure out if the next number on our list is prime or composite before you check your answer.





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