using System;
 namespace Builder2
 {
       public class Class1
       {
              public Class1()
              {
                    
              }
      public void IsPrime (long NumToCheck ) {
         for (long i =2; i <= Math.Sqrt(NumToCheck); i++) {
            if (NumToCheck%i == 0 ) {
               // not a prime
               return;
            }
         }
         // is a prime, fire the event
         return;
      }
       }
 }