题解 | 素数判断

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        int count = in.nextInt();
        while (in.hasNext()) { // 注意 while 处理多个 case
            int a = in.nextInt();
             if(a ==1){
                System.out.println("No");
                continue;
            }
            if(a ==2){
                System.out.println("Yes");
                continue;
            }
            boolean issu = true;
            for(int i=2; i <= a/2; i++){
                if(a%i == 0){
                     issu = false;
                     break;
                }
            }
            if(issu){
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }
        }
    }
}