check number is Prime or not Prime in c#.

            int number = 13;
            int pr = 0;
            for (int i = 2; i < number; i++)
            {
                if (number % i == 0)
                {
                    pr++;
                }
            }
            if (pr > 0)
            {
                Console.WriteLine("No is not Prime");
            }
            else
            {
                Console.WriteLine("No is Prime");
            }