A prime number has exactly two divisors: 1 and itself.
A composite number has more than two divisors.
To factor a number into primes means to write it as a product of prime numbers.
2, 3, 5, 7, 11, … are prime
4, 6, 8, 9, 10, … are composite
Prime factorization helps with GCD and LCM
Factorizations explained
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