請判斷某數是否為質數

 import java.util.Scanner;

public class a007 {

public static void main(String[] args) {

Scanner input=new Scanner(System.in);

int i,x;

while(input.hasNext()){

x=input.nextInt();

for (i=2;i<=Math.sqrt(x);i++){

if(x%i==0){

System.out.println("非質數");

break;

}

}

if(i>Math.sqrt(x)){

System.out.println("質數");

}

}

}

}