These are the numbers from 1 to 91 that are prime numbers: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89.
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The prime number is 97 because it is only divisible by 1 and itself. 91 is divisible by 1, 7, 13, and 91.
91 is the only composite factor of 91. 7 and 13 are prime.
They are: 7 times 13 = 91
The product of the fourth and sixth prime numbers is 91.
A person unfamiliar with prime numbers could mistake 51, 91, or any other composite number for a prime number if the person did not factor the number to make sure it had no other factors then 1 and itself.