Another legitimate meaning might be "factoring probable primes" (or "candidate primes" as they are sometimes called in key generation/cryptanalysis), or possibl

Another legitimate meaning might be "factoring probable primes" (or "candidate primes" as they are sometimes called in key generation/cryptanalysis), or possibly "factoring semiprimes". Both of those phrases could be referred to as "prime factorisation" in a not-entirely-accurate-but-unambiguous-in-context shorthand. https://en.wikipedia.org/wiki/Probable_prime https://en.wikipedia.org/wiki/Probable_prime https://en.wikipedia.org/wiki/Semiprime https://en.wikipedia.org/wiki/Semiprime