To determine if 3105 is a prime number or a composite number, we simply look at the factors for 3105.
If the factors of 3105 are only 3105 and 1, then we know that 3105 is a prime number. Otherwise, 3105 is a composite number.
To explain better, if 3105 is only divisible by 1 and 3105, then it is a prime number, and if 3105 is divisible by more than 3105 and 1, then it is a composite number.
The factors of 3105 are as follows:
1, 3, 5, 9, 15, 23, 27, 45, 69, 115, 135, 207, 345, 621, 1035, 3105
Therefore, since 3105 is divisible by more than one and itself, the answer to the
question "Is 3105 prime or composite?" is highlighted in blue below.
composite
Is 3106 prime or composite?
OK. Now you know that 3105 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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