prime integer

例句：

1. 1. The prime minister is expected to deliver a speech at the conference tomorrow.
   预计首相将在明天的会议上发表演讲。
2. 2.The prime number 5 is the smallest number that can be divided by all other numbers.
   质数5是所有其他数字都能整除的最小数字。
3. 3. Prime numbers are often used in cryptography because they have a limited number of possible divisors.
   质数在密码学中经常被使用，因为它们有有限数量的可能除数。