Which number is a factor of 12, but not a multiple of 6?

To solve this, list all the known integer factors of 12:

3 and 4, 2 and 6, 1 and 12.

Now, look at each factor (1, 2, 3, 4, 6, 12) and list a couple of the multiples of 6 which include: 6, 12, 18, 24, 30, etc.

When you look back at the factors you notice that 1,2,3, and 4 are not a multiple of 6, therefore 1,2,3, and 4 are the numbers which is a factor of 12 and not a multiple of 6.

4

4*3 is 12 but 4 is not a multiple of 6