To determine if 2115 is a prime number or a composite number, we simply look at the factors for 2115.
If the factors of 2115 are only 2115 and 1, then we know that 2115 is a prime number. Otherwise, 2115 is a composite number.
To explain better, if 2115 is only divisible by 1 and 2115, then it is a prime number, and if 2115 is divisible by more than 2115 and 1, then it is a composite number.
The factors of 2115 are as follows:
1, 3, 5, 9, 15, 45, 47, 141, 235, 423, 705, 2115
Therefore, since 2115 is divisible by more than one and itself, the answer to the
question "Is 2115 prime or composite?" is highlighted in blue below.
composite
Is 2116 prime or composite?
OK. Now you know that 2115 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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