C Program To Check Given Number Is Prime or Not

/* C Program To Check Given Number Is Prime or Not */

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 #include <stdio.h>  
 #include <conio.h>  
 #include <math.h>  
 void main()  
 {  
   int number,i,flag=0;  
   clrscr();  
   printf("Enter a number");  
   scanf("%d",&number);  
   for(i=2;i<=sqrt(number);i++)  
   {  
     if(number%i==0)  
     {  
       flag=1;  
       break;  
     }  
   }  
   if(flag==1)  
   {  
     printf("Given number is not prime");  
   }  
   else  
   {  
     printf("Given number is prime number");  
   }  
   getch();  
 }