#include <iostream>
using namespace std;
int main() {
int c=0;
int n,i;
cout<<"enter a no";
cin>>n;
for(i=1;i<=n;i++)
{
if(n%i==0)
c++;
}
if(c==2)
cout<<"prime nos.";
else
cout<<"niot a prime no"
// your code goes here
return 0;
}
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