Fundamental Theorem of Arithmatics (FTA) every integer greater than is either a prime or it is a products of primes, and this product is unique.

Prime factorization

Any factor Method

Just find any factor, and continue the fractorizaton, until all factors are primes:


Start dividing the number by the smallest prime until we get to .

Factor Tree

A special diagram where we find the factors of a number, then the factors of those numbers, etc, until we can’t factor any more.

factor tree of 42