3240 = 2 * 2 * 2 * 3 * 3 * 3 * 3 * 5
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3240 = 23 x 34 x 5
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.