Tech Number in Java

import java.util.Scanner;  
public class TechNumberExample2  
{  
public static void main(String args[])  
{  
int n, num, firstHalf, secondHalf, digits = 0, squareOfSum = 0;  
Scanner sc = new Scanner(System.in);  
System.out.print("Enter a number to check: ");  
//reads an integer from the user  
n = sc.nextInt();  
//assign the value of n into num  
num = n;  
//the loop executes until the condition returns false  
while (num > 0)  
{  
//incerements the variable digits by 1      
digits++;  
//removes the last digit of the given number  
num = num / 10;  
}  
//check if the given number has an even number of digits or not  
if (digits % 2 == 0)  
{  
num = n;  
//determines the first half of the given number  
firstHalf = num % (int) Math.pow(10, digits / 2);  
//determines the second half of the given number  
secondHalf = num / (int) Math.pow(10, digits / 2);  
//calculate the square of both the numbers  
squareOfSum = (firstHalf + secondHalf) * (firstHalf + secondHalf);  
//compares the square of the sum with the given number  
if (n == squareOfSum)  
{  
System.out.println(n+" is a tech number.");  
}  
else  
{  
System.out.println(n+" is not a tech number.");  
}  
}  
else  
{  
System.out.println(n+ " is not a tech number.");  
}  
}  
}  

Output :

Enter a number to check: 2025
2025 is a tech Number.