单词：prime number
prime number的用法和样例：
例句
- Not all the odd numbers are prime numbers.不是所有的奇数都是质数。
- Because 19 and 2 have only two divisors: 1 and themselves, they are prime numbers.因为19和2都各只有两个约数：1和它们本身，所以它们是质数。
- Cray number crunchers discovered the largest prime number.克来公司的电脑发现了世界上最大的素数。
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