If M=P*Q, where P and Q are different positive integers,

Hi Guys,

If M=P*Q, where P and Q are different positive integers, including 1 and M, how many factors does M have?
(1) Including 1 and itself, P has 3 factors.
(2) Including 1 and itself, Q has 3 factors.

I got the answer to this, my question is - if you had to calculate, how many factors does M have in total and which ones would they be?

Source: Not Sure

Thanks !