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Is this Number Prime

/ Published in: C#
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Method to Check if an int is a Prime Number

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  1. static bool isPrime(int number)
  2.         {
  3.  
  4.             if (number == 1) return true;
  5.             if (number == 2) return true;
  6.             if (number == 3) return true;
  7.             if (number == 4) return false;
  8.  
  9.             for (int i = 2; i <= Math.Ceiling(Math.Sqrt(Convert.ToDouble(number))); i++)
  10.             {
  11.                 if (number % i == 0)
  12.                 {
  13.                     return false;
  14.                 }
  15.             }
  16.  
  17.             return true;
  18.  
  19.         }

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