To determine if 3991 is a prime number or a composite number, we simply look at the factors for 3991.
If the factors of 3991 are only 3991 and 1, then we know that 3991 is a prime number. Otherwise, 3991 is a composite number.
To explain better, if 3991 is only divisible by 1 and 3991, then it is a prime number, and if 3991 is divisible by more than 3991 and 1, then it is a composite number.
The factors of 3991 are as follows:
1, 13, 307, 3991
Therefore, since 3991 is divisible by more than one and itself, the answer to the
question "Is 3991 prime or composite?" is highlighted in blue below.
composite
Is 3992 prime or composite?
OK. Now you know that 3991 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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