C/C++ Program to find a given number is Prime (or) not.

// Program to find a given number is  Prime (or) not.
#include<iostream>
using namespace std;
int main()
{
int n,i,is_prime=1;
cout<<"\n enter a number"<<endl;
cin>>n;
for(i=2;i<n;i++)
{
if(n%i==0)
    is_prime=0;
}
if(is_prime)
cout<<n<<" is a prime"<<endl;
else
cout<<n<<" not a prime "<<endl;
return 0;
}