Check Whether Number is Prime or not.

 #include <stdio.h>

int main()

{

    int number,i;

    printf("enter a number");

    scanf("%d",&number);

    for(i=2;i<=number;i++)

    if(number%i==0)

    break;

    if(i==number)

    printf("%d is a prime number",number);

    else

    printf("%d is not a prime number",number);

    return 0;

}