Perfect Square

/**
 * This program inputs a number and checks whether the number entered is a perfect square or not.
 */
import java.util.Scanner;
public class Perfect_Square
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Please enter a number.");
        int num=sc.nextInt();
        int i,prod,flag=0;
        for(i=1;i<=num;i++)
        {
            prod=i*i;
            if(prod==num)
            {
                flag=1;
                break;
            }
        }
        if(flag==1)
        {
            System.out.println(num+" is a perfect square.");
        }
        else
        {
            System.out.println(num+" is not a perfect square.");
        }
        sc.close();
    }
}