C :

#include<stdio.h>
int main()
{
  int n,i,j;
  char a[10],b[10];
  while(scanf("%d",&n)!=EOF)
  {
     sprintf(a,"%d",n);
     sprintf(b,"%d",n*n);
     for(i=strlen(a),j=strlen(b);i>=0&&j>=0;i--,j--)
                        if(a[i]!=b[j])
                                break;
                if(i<0)
                        puts("Yes!");
                else
                        puts("No!");
  }
  return 0;
}

C++ :

#include<stdio.h>
#include<string.h> 

int main()
{
	int n,i,j;
	char a[10],b[10];
	while(scanf("%d",&n)!=EOF)
	{
		sprintf(a,"%d",n);
		sprintf(b,"%d",n*n);
		for(i=strlen(a),j=strlen(b);i>=0&&j>=0;i--,j--)
			if(a[i]!=b[j])
				break;
		if(i<0)
			puts("Yes!");
		else
			puts("No!"); 
	}
	return 0;
}

Java :

import java.util.*;

public class Main{
  public static void main(String args[]){
   Scanner jin=new Scanner(System.in);
    while(jin.hasNextInt()){
     int n=jin.nextInt();
      int nn=n*n;
      if((n<10&&nn%10==n)||(n>=10&&n<100&&nn%100==n))
        System.out.println("Yes!");
      else System.out.println("No!");
    }
  }
}