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.
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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