There may not be any fast methods. In fact, composite numbers which are the product of two very large primes are used for public key encryption. This depends on the fact that there is no fast answer to factorising composite numbers.
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Print out a list of prime numbers. Composite numbers are the ones that aren't on it.
To find a composite number, check if the number can be divided by 2,3,4,5, ect. If it can, it`s composite. If not, it`s prime.
simplify it
52 is composite. You need at least two numbers to find a GCF.
Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.
Prime numbers are used to find the product of the prime factors of composite numbers.