You don't. 13 is a prime number.
The prime factorization of 91 is: 7 x 13
13 is already prime. Just write it down.
13 is a prime, so its prime factorization is: 13
13 x 13 = 169 The prime factor of 169 is 13. 13 is the square root of 169.
The prime factorization of 728 is: 2 x 2 x 2 x 7 x 13
13 is already prime. No factorization.
13 is already prime, no factorization required.
13 is already prime and doesn't need a prime factorization.
7 and 13 are already prime, no factorization required.
The prime factorization of 91 is 13 x 7 They are both prime so its a prime factorization
2 x 3 x 13 = 78