C program to find whether it is prime number or not

C program to find whether it is prime number or not:

Prime number is the number which can only divided by one (1) and itself.

For Example: 2, 3, 5, 7, 11 are some prime numbers. These numbers can only be divided by 1 or itself.

#Example

  #include <stdio.h>
  void main()
  {
     int num, reminder;
     
     printf("Enter a positive number: ");
     scanf("%d",&num);
     
     //stores reminder in reminder var.
     reminder = num % 2;

     if(remonder == 0)
     {
        printf("%d is a prime number.",num);
     }
     else
     {
        printf("%d is not a prime number.",num);
     }
  } 

Output

  Enter a positive number: 5
  5 is a prime number.