Question 668608
The way I go about this is I run through my usual list of primes {2,3,5,7,11}..etc

I divide by a prime until I can't divide by that one anymore. I continue this process until I have 1.

45/2 no.

45/3 = 15/3 = 5

5/5 = 1

So I divided by 3 twice and 5 once.

Hence, {{{3^2 * 5}}}.