Prime Number Program in C++

It is very simple to write Prime Number Program in C++, you need basic concept of for loop and if else.

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int num,count=0;
cout<<"Enter any Number: ";
cin>>num;
for(int a=1;a<=num;a++)
{
if(number%a==0)
{
count++;
}
}
if(count==2)
{
cout<<"It is Prime Number"<<endl;
}
else
{
cout<<"It is not Prime Number "<<endl;
}
getch();
}