The factors of 2 are 1 and 2 because 2 divides by 1 and 2
The factors of 3 are 1 and 3 because 3 divides by 1 and 3

The factors of 4 are 1, 2 and 4 because 4 divides by 1, 2 and 4

The factors of 5 are 1 and 5 because 5 divides by 1 and 5

The factors of 6 are 1, 2, 3 and 6 because 6 divides by 1, 2, 3 and 6

The factors of 7 are 1 and 7 because 7 divides by 1 and 7

The factors of 12 are 1, 2, 3, 4, 6 and 12 because 12 divides by 1, 2, 3, 4, 6 and 12