91 = 7 x 13
Chat with our AI personalities
91 is the only composite factor of 91. 7 and 13 are prime.
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.
7 x 13 89 + 2
They are: 7 times 13 = 91
The product of the fourth and sixth prime numbers is 91.