To determine if 1391 is a prime number or a composite number, we simply look at the factors for 1391.
If the factors of 1391 are only 1391 and 1, then we know that 1391 is a prime number. Otherwise, 1391 is a composite number.
To explain better, if 1391 is only divisible by 1 and 1391, then it is a prime number, and if 1391 is divisible by more than 1391 and 1, then it is a composite number.
The factors of 1391 are as follows:
1, 13, 107, 1391
Therefore, since 1391 is divisible by more than one and itself, the answer to the
question "Is 1391 prime or composite?" is highlighted in blue below.
composite
Is 1392 prime or composite?
OK. Now you know that 1391 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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