import java.util.Scanner;

public class NeonNumber {

    public static void main(String[] args) {

        // Get input from user
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number to check if it is a neon number: ");
        int number = scanner.nextInt();
        
        // Calculate square of number
        int square = number * number;

        // Calculate sum of digits of square
        int sum = 0;
        while (square != 0) {
            int digit = square % 10;
            sum += digit;
            square /= 10;
        }

        // Check if sum of digits of square is equal to number
        if (sum == number) {
            System.out.println(number + " is a neon number");
        } else {
            System.out.println(number + " is not a neon number");
        }
    }
}

Enter a number to check if it is a neon number: 9
9 is a neon number

Enter a number to check if it is a neon number: 13
13 is not a neon number