title: Check if number is prime number
body: <p>I would just like to ask if this is a correct way of checking if number is prime or not? because I read that 0 and 1 are NOT a prime number.    </p>
  
  <pre><code>int num1;
  
  Console.WriteLine("Accept number:");
  num1 = Convert.ToInt32(Console.ReadLine());
  if (num1 == 0 || num1 == 1)
  {
      Console.WriteLine(num1 + " is not prime number");
      Console.ReadLine();
  }
  else
  {
      for (int a = 2; a &lt;= num1 / 2; a++)
      {
          if (num1 % a == 0)
          {
              Console.WriteLine(num1 + " is not prime number");
              return;
          }
  
      }
      Console.WriteLine(num1 + " is a prime number");
      Console.ReadLine();
  }
  </code></pre>