判断一个数是否是素数

package com.test1;import java.util.Scanner;import java.math.*;public class test8 {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubTest t = new Test();t.play();}}class Test {public void play() {System.out.println("请输入数字");Scanner s = new Scanner(System.in);int m = s.nextInt();int k = (int) Math.sqrt(m);int i = 2;// System.out.println(number);for (i = 2; i <= k; i++) {if (m % i == 0) {break;}}if (i > k) {System.out.println("是素数");} else{System.out.println("不是素数");}}}