说明：素数分解：、在许多情况下，知道一个数是素数还不够，还需要知道它的约数。

Prime decomposition: in many cases, know that a number is prime is not enough, it also needs to know about the number.

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这个因数分解是唯一的，被称为素数分解(prime factorization)。

This factorization is unique, known as prime decomposition (prime factorization).

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注意，同一个素数在因数分解中可以出现多次。

Note that, in the same prime factorization can appear multiple times.

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