素数（质数）

public class Test{
public static void main(String[] args)  {
for(int i = 2; i < 10000; ++i){
boolean b = true;
for(int k = 2; k <= Math.sqrt(i); ++k){
if(i%k == 0){
b = false;
break;
}
}
if(b == true)
System.out.println(i);
}
}
}