Problem 8 - Prime Number Check with exeptions

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PrimeNumberCheck
{
    class PrimeNumberCheck
    {
        static void Main()
        {
            int number;
            string digits;
            do
            {
                Console.WriteLine("Enter a random number to check if it's prime:");
                digits = Console.ReadLine();
            }
            while (!int.TryParse(digits, out number)); // Check that the information is correct.
            // Enter digits
            bool enterValue = true;
            try
            {
                if (number == 0 || number == 1)
                {
                    Console.WriteLine(number + " is not a prime number");
                }
                for (int i = 2; i <= Math.Sqrt(number); i++)
                {
                    if (number % i == 0)
                    {
                        enterValue = false;
                        break;
                    }
                }
                Console.WriteLine("{0} {1}", number, enterValue ? "is a prime number" : "is not a prime number");
            }
            catch (ArgumentNullException ae)
            {
                PrintMessage(ae);
            }
            catch (FormatException fe)
            {
                PrintMessage(fe);
            }
            finally
            {
                Console.WriteLine("Thank you that you checked and used the program :) \n");
            }
        }
        static void PrintMessage(Exception error)
        {
            Console.Error.WriteLine("\nValidation is wrong\n-> {0}\n", error.Message);
        }
    }
}