Write a program to check given number is prime or not

#include<stdio.h>
#include<conio.h>
int main()
{
int no,i,j,flag=0;
printf("enter the number");
scanf("%d",&no);
for(i=2;i<no;i++)
{
if(no%i==0)
{
flag=1;
break;
}
else
flag=0;
}
if(flag==1)
printf("no is not prime");
else
printf("no is prime");
}