When all the factors are prime numbers, that's a prime factorization.
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a prime factorization tree
397 is a prime number, therefore prime factorization of 397 = 397.
41 is a prime number which makes 41 the gcf of 41 and 82
The prime factorization of the number 26 is: 2 x 13
Prime factorization of the number 54 is 2 x 33.