写一程序：读入一整数并检验它是否是质数。

Write a program to read in a whole number and test if it is a prime.

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OD数据处理模块主要是对OD调查表中的每一条数据进行检验和处理，最后输出是处理完毕的单点OD数据，具体包括两个功能：数据读入、数据检验。

Od data processing module is used to check every data in the od data table, and finally output the single od data table. It includes two functions: data read and data verification.

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