6.5 and 2
13 x 1
1 and 13
No whole numbers, if that's what you mean, except for the trivial 1 x 13. 13 is a prime number.
12 and 13
13 x 17 = 221
13*13
13 x 1
1 and 13
13 and 3
3 and 13.
12 and 13
How about: 13 times 13 = 169
-1
5*13 = 65
9*13 = 117
27
13*31=403 13 and 31 are prime numbers.