To determine if 2015 is a prime number or a composite number, we simply look at the factors for 2015.
If the factors of 2015 are only 2015 and 1, then we know that 2015 is a prime number. Otherwise, 2015 is a composite number.
To explain better, if 2015 is only divisible by 1 and 2015, then it is a prime number, and if 2015 is divisible by more than 2015 and 1, then it is a composite number.
The factors of 2015 are as follows:
1, 5, 13, 31, 65, 155, 403, 2015
Therefore, since 2015 is divisible by more than one and itself, the answer to the
question "Is 2015 prime or composite?" is highlighted in blue below.
composite
Is 2016 prime or composite?
OK. Now you know that 2015 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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