prime factors

Irreducible building blocks

Prime factors are the prime numbers that multiply together to give a particular number.

Every integer greater than 1 can be expressed as a unique product of primes: the prime factors of 12 are 2, 2, and 3, since 2 × 2 × 3 = 12.

Finding prime factors—prime factorization—is fundamental in number theory and cryptography.

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