#include 
    
     #include 
     
      #include 
      
       int wangquan(int n){    int i;    for(i=2;i<=sqrt(n);i++)        if(n%(i*i)==0)            return 1;    return 0;}int main(){    int n=1;    while(n!=0)    {        scanf("%d",&n);        if(n<=0||n>=10000)            continue;        if(wangquan(n))            printf("Yes\n");        else            printf("No\n");    }    return 0;}