is -5 a real #?
rational #?
irrational #?
whole #?
integer?
counting (natural) #?
An irrational number is a number whose digits after the decimal do not repeat, such as π, √2, etc.
-5 is all of the above except irrational number and one other type.
To read more about numbers, visit the following link:
http://en.wikipedia.org/wiki/Number