To determine if 315 is a prime number or a composite number, we simply look at the factors for 315.
If the factors of 315 are only 315 and 1, then we know that 315 is a prime number. Otherwise, 315 is a composite number.
To explain better, if 315 is only divisible by 1 and 315, then it is a prime number, and if 315 is divisible by more than 315 and 1, then it is a composite number.
The factors of 315 are as follows:
1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315
Therefore, since 315 is divisible by more than one and itself, the answer to the
question "Is 315 prime or composite?" is highlighted in blue below.
composite
Is 316 prime or composite?
OK. Now you know that 315 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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