#include <iostream>
using namespace std;
int main()
{
int num;
do
{
cout<<"Enter an integer"<<endl;
cin>>num;
}while(num<=0);
int count=0;
int i=num;
while(i>=1)
{
if(num%i==0)
{
++count;
}
--i;
}
if(count==2)
{
cout<<"It is a prime number."<<endl;
}
else cout<<"It is not a prime number."<<endl;
}
