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Expresses a number as a product of prime numbers. Every integer > 1 has a unique prime factorization (Fundamental Theorem of Arithmetic).
RSA encryption, used to protect most internet transactions, relies on the fact that multiplying two primes is easy but factoring the product back into those primes is computationally infeasible for large enough numbers.
Starting with a non-prime divisor and not breaking it down further — 12 ÷ 4 = 3, but 4 = 2² so the full factorization is 2² × 3, not 4 × 3.