Zero is basically its own unique number. It is not even or odd. It is not a prime number. It is also not a composite number. Zero is, however, a rational number.
http://answers.ask.com/Science/Other/what_kind_of_...

India.
http://wiki.answers.com/Q/Where_did_the_number_zer...

1. Set a timer for 5 minutes and count as quickly as you can until the timer signals the 5 minutes have expired. Take this number, no matter how high or low it is, and use long division
http://www.ehow.com/how_2054935_knownumberdivisi...

It's not so much the inclusion of zero as it is the use of a positional numbersystem, like our modern base10 one. The Maya were using base 20, and had a relatively simplistic way
http://www.quora.com/HistoryofScience/Whatisth...
