Sunny Number In Java

import java.util.Scanner;
    class Rajput{
      public static void main(String[] args) {
        double x;  //sqrt(num+1)
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a number");
        int num = sc.nextInt();
        x = Math.sqrt(num+1);

        if((int)x == x)
        {
           System.out.println("it is SunnyNumber");

        }
        else{
          System.out.println("it is not SunnyNumber");
        }
      }
    }