#include <stdio.h>
#include <stdlib.h>

int IsSquare(int n);
 int main()
 {

      int n ,flag = 0 ;
      printf("input n: ");
      scanf("%d",&n);
      flag = IsSquare(n);
      if(flag)
            printf("YES\n");
      else
            printf("NO\n");
      return 0;


 }

int IsSquare(int n)
{
      int i,flag = 0;
      for(i = 0; i<= n;i++)
      {
            if(i * i == n)
                 flag = 1;
      }
      return flag;
}