最最入门的题解

#include <iostream>
using namespace std;
int s(int a)
{
if (a == 1)
{
return 1;
}
for (int i = 2; i < a; i++)
{
if (a%i == 0)
{
return 1;
}
}
return 0;
}
int main(){
int num;
cin >> num;
int n = s(num);
if (n == 1)
{
cout << "No";
}
if (n == 0)
{
cout << "Yes";
}
return 0;
}