Answer 1

#include <iostream>
using namespace std;

int main() {
int i;
int a;
bool isPrime = true;

cout << "Enter a number: ";
cin >> a;
cout << a << " and is ";

for(i = 2; i <= a / 2; ++i)
{
if(a % i == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
cout << "a prime number";
}
else {
cout << "not a prime number";
}
return 0;
}