质数 (zhìshù): prime number

Measure Word

一个质数 gè

2、3、5、7都是质数。

2、3、5、7 dōu shì zhìshù.

2, 3, 5, and 7 are all prime numbers.

Zhìshù zhǐ néng bèi 1 hé tā běnshēn zhěngchú.

A prime number can only be divided evenly by 1 and itself.

memory

质 suggests the essential 'nature' of a number — a prime number is in its most essential, indivisible form.

质 zhì

数 shù