C Coding of a Number is Prime or Not

#include<stdio.h>
#include<conio.h>
int main()
{
int num,i,count=0;
clrscr();
printf("input number=");
scanf("%d",&num);
for(i=2;i<=num/2;i++)
{
if(num%i==0)
count++;
}
if(count==0&&num!=1)
printf("%d is a prime number",num);
else
printf("%d is not a prime number",num);
getch();
return 0;
}