prime number
noun [ C ] mathematics uk/ˌpraɪm ˈnʌm.bər/ us/ˌpraɪm ˈnʌm.bɚ/
质数，素数
a number that cannot be divided by any other number except itself and the number 1
2, 3, and 7 are prime numbers. 2，3和7是素数。
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