#include <stdio.h>

int main(){
	int n;
	printf("\nNhap n = ");
	scanf("%d", &n);
	int i = 0;
	while(i*i <= n){
		if(i*i == n){
			printf("%d la so chinh phuong!\n", n);
			return 0;
		}
		++i;
	}
	printf("%d khong phai so chinh phuong!\n", n);
}

C++:

#include <bits/stdc++.h>
using namespace std;
int main() 
{
  int n; cin >> n;
  int k = sqrt(n);
  if (k * k == n) cout << "Yes";
  else cout << "No";
}

C:

#include <stdio.h>
#include <math.h>
int main() 
{
    int n;
    scanf("%d", &n);
    int k = sqrt(n);
    if (k * k == n)  printf("Yes\n");
    else  printf("No\n");
}

Chúc bn học tốt!

$\color{Red}{\triangleright \triangleright\ \color{ Red}{\text{ThienPhuc123} \triangleleft \triangleleft}}$