多线程的程序，求素数。用户运行程序时在命令行输入一个素数，然后程序创建一个独立新的线程来输出小于或等于用户所输入数的所有素数。-Multithreaded program, find the prime numbers. When users run the program on the command line enter a prime number, then the program creates a separate new thread to output less than or equal the number entered by the user of all prime.