质数
质数（Prime number），又叫素数，指拉大于1个自然数中，除了1搭该数自身外，无法被其他自然数整除个数（也可定义为只有1搭该数本身两个正因数个数）。大于1个自然数若弗是素数，则叫作合数（也叫作合成数）。
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