Prime Number

using System;


namespace PrimeNumberCheck
{
    class PrimeNumberCheck
    {
        static void Main()
        {
            Console.Write("Enter a positive number n <= 100: ");
            try
            {
                byte number = byte.Parse(Console.ReadLine());
                if (number > 1 && number <= 100)
                {
                    bool isPrime = true;
                    byte numberSqrt = (byte)Math.Floor(Math.Sqrt(number)); //Proverka do koren kvadraten na chisloto.
                    for (int i = 2; i <= numberSqrt; i++)
                    {
                        if (number % i == 0)
                        {
                            isPrime = false;
                            break;
                        }
                    }
                    Console.WriteLine(isPrime);
                }
                else
                {
                    Console.WriteLine(false);
                }
            }
            catch (FormatException)
            {
                Console.WriteLine("Invalid Number!");
            }
            catch (OverflowException)
            {
                Console.WriteLine("Invalid Number!");
            }
        }
    }
}