Look up the definition of a Unique Factorisation Domain and a prime element of a ring. The theorem that the integers form a UFD necessarily takes into account n

Look up the definition of a Unique Factorisation Domain and a prime element of a ring. The theorem that the integers form a UFD necessarily takes into account negative primes. [Edit] Here: https://en.wikipedia.org/wiki/Unique_factorization_domain https://en.wikipedia.org/wiki/Unique_factorization_domain