Problem 8 - Prime Number Check

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
            double numberSqrt = Math.Sqrt(number);
            int numberSqrtRound = (int)Math.Round(numberSqrt);
            if (number == 0 || number == 1)
            {
                Console.WriteLine(number + " is not a prime number");
            }
            else
            {
                for (int i = 2; i <= numberSqrtRound; i++)
                {
                    if (number % i == 0)
                    {
                        Console.WriteLine(number + " is not a prime number.");
                        return;
                    }
                }
                Console.WriteLine(number + " is a prime number.");
            }
        }
    }
}