JAVA Help

import java.util.*;
class automorphic
{
    public static void main()
    {
        Scanner s=new Scanner(System.in);
        int n,i,sq,a,sum=0;
        System.out.println("enter a no.");
        n=s.nextInt();
        i=n;sq=n*n;
        while(i>0)
        {
            a=i%10;
            sum++;
            i=i/10;
        }
        if(sq%(int)Math.pow(10,sum)==n)
        System.out.println("automorphic no.");
    }
}