#include <bits/stdc++.h>
using namespace std;
int n,m;
void init(){
cout<<"Nhap 1 so nguyen n:";
cin>>n;
m=sqrt(n);
}
void solve(){
if(m*m==n)
cout<<"Yes";
else
cout<<"No";
}
int main() {
init();
solve();
return 0;
}
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