Number Theory

If a number is divisble by 6, then it is also divisble by $1,2,3,6$

Now, let's take a look at factors of 6. 

We know that $12$ has 6 factors, as we have $1,2,3,4,6,12$

18 also 6 factors, as we have $1,2,3,6,9,18$

However, 24 has exactly 8 factors. We have

$1,2,3,4,6,8,12,24$

The prime factors are $2,3$, so our answer is just 2. 

So there are 2 prime factors. 

Thanks! :)