To determine if 3915 is a prime number or a composite number, we simply look at the factors for 3915.
If the factors of 3915 are only 3915 and 1, then we know that 3915 is a prime number. Otherwise, 3915 is a composite number.
To explain better, if 3915 is only divisible by 1 and 3915, then it is a prime number, and if 3915 is divisible by more than 3915 and 1, then it is a composite number.
The factors of 3915 are as follows:
1, 3, 5, 9, 15, 27, 29, 45, 87, 135, 145, 261, 435, 783, 1305, 3915
Therefore, since 3915 is divisible by more than one and itself, the answer to the
question "Is 3915 prime or composite?" is highlighted in blue below.
composite
Is 3916 prime or composite?
OK. Now you know that 3915 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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