C# Part 1 / Operators and Expressions / 07. PrimeNumber

using System;

class PrimeNumber
{
    static void Main()
    {
        Console.Write("Enter number  below 100 :");
        int primeNumber = int.Parse(Console.ReadLine());
        if (primeNumber <= 100)
        {
            if ((primeNumber % primeNumber == 0 && primeNumber % 1 == 0 && primeNumber % 2 != 0 && primeNumber % 3 != 0 && primeNumber % 5 != 0)
                || ((primeNumber == 2) || (primeNumber == 3) || (primeNumber == 5)))
            {
                Console.WriteLine("The number is prime");
            }
            else
            {
                Console.WriteLine("not prime");
            }
        }
        else
        {
            Console.WriteLine("invalid number");
        }

    }
}