Check prime number

#include <iostream>
using namespace std;

bool isPrime(int n) {
if (n<= 1) return false;

for (int i = 2; i <= n / 2; i++) {
    if (n % i == 0) {
        return false;
    }
}

return true;

}

int main() {
int n;
cout << "Enter a number: ";
cin >> n;

if (isPrime(n)) {
    cout << n << " is a prime number." << endl;
} else {
    cout << n << " is not a prime number." << endl;
}

return 0;

}