The prime factorization of 756 is 2 x 2 x 3 x 3 x 3 x 7, or 22 x 33 x 7 in exponential form.
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756 = 22 × 33 × 7
When all the factors are prime numbers, that's a prime factorization.
a prime factorization tree
397 is a prime number, therefore prime factorization of 397 = 397.
Prime factorization of the number 54 is 2 x 33.