C Program to Check Whether a Number is Prime or Not

Prime Number : A prime number is a positive integer which is divisible only by 1 and itself. For example: 2, 3, 5, 7, 11, 13

#include
int main()
{
    int n, i, temp = 0;

    printf("Enter a positive integer: ");
    scanf("%d",&n);

    for(i=2; i<=n/2; ++i)
    {
        // condition for non prime number
        if(n%i==0)
        {
            temp=1;
            break;
        }
    }

    if (temp==0)
        printf("%d is a prime number.",n);
    else
        printf("%d is not a prime number.",n);

    getch();
}

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OUTPUT :-