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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