39 is not divisible by 2, since it is odd. Looking at the next highest Prime number 3, we see that it is divisible, so we divide by three until it is no longer divisible by 3:
39/3 = 13
13 is also prime, thus 3*13 is the prime factorization.
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23 x 29
The prime factorization of 900 is 2 x 2 x 3 x 3 x 5 x 5. In exponential notation, that's 22 x 32 x 52
It is: 2^2*3^3*5 =540
The prime factorization of 140 is: 2 x 2 x 5 x 7
If you are using integers, it is prime.