No, It's the metric unit for length
Yes.
Kilometer is the largest unit in the metric system
kilometer
Yes, anything with 'meter' such as kilometer, meter, centimeter, decimeter, millimeter, etc. is a unit of measurement in the metric system.
The 'kilometer' is a unit of length or distance in the metric system.
Kilometer as regards to distance
A kilometer is one thousand meters(kilo means one thousand).
-- meter -- hectometer -- kilometer
they all have to so with the metric system
There isn't a separate US metric system, the metric system is international and the same everywhere. So one kilometre in the U.S.A. is one kilometre.
1000mm, or 1/1000 of a kilometer