It is always 1 and the Prime number itself.
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The number 1 and the prime number itself.
Prime factorization is when you find all the prime factors of a number.
All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number.
Any prime number only has two factors, one and the number itself.
All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number, otherwise it is.