import java.util.Scanner; public class zhi { //质数判断 static boolean panduan(int n) { if (n == 2 || n == 3) return true; if (n % 2 == 0) return false; int i; for (i = 3; i <= (int) Math.sqrt(n); i += 2) if (n % i == 0) return false; return true; } public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("输入数值"); int n = in.nextInt(); if (panduan(n)) System.out.print(n + "是质数")