To determine if 91 is a prime number or a composite number, we simply look at the factors for 91.
If the factors of 91 are only 91 and 1, then we know that 91 is a prime number. Otherwise, 91 is a composite number.
To explain better, if 91 is only divisible by 1 and 91, then it is a prime number, and if 91 is divisible by more than 91 and 1, then it is a composite number.
The factors of 91 are as follows:
1, 7, 13, 91
Therefore, since 91 is divisible by more than one and itself, the answer to the
question "Is 91 prime or composite?" is highlighted in blue below.
composite
Is 92 prime or composite?
OK. Now you know that 91 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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