what is 6

6, is actually very important.

From the Romans, 6 is a (The First) perfect number.

Here is some Information on it if you don't know much of it.

http://en.wikipedia.org/wiki/Perfect_number

Or if you just want a brief summary, a Perfect Number is a number when all of it's Factors add up to it (Not including the number itself).

6 = 1,2,3(,6 not included)

1+2+3=6

Here are the first five Perfect number.

6

28

496

8128

33550336

6 is a arabian number

I would have called 6 a Hindu-arabic number  :)