C++ Program : To find given number is prime or not

#include<iostream.h>
#include<conio.h>

class number
{
   public:
   int num;
   int isprime();
};
int number::isprime()
{
   for(int i=2;i<num;i++)
      if(num%i==0)
          return 0;
   return 1;
}

int main()
{
   number x;
   clrscr();
   cout<<"Enter the number:";
   cin>>x.num;
   if(x.isprime())
      cout<<"The number is prime";
   else
      cout<<"The number is not prime";
   getch();
   return 0;
}

Class diagram 

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