Java中算素数的实现

这是题目要求 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        double input = in.nextDouble();
        int y = 0;

        while (in.hasNext()){
            int n = 0;
            double a = in.nextDouble();
            for(int i =2;i<=Math.sqrt(a);i++){
                    if(a%i==0)
                       n++;

            }

            if(n!=0)
                System.out.println("No");
            else
                System.out.println("Yes");
        }

    }
}