There are many uses for the term (see link). The question needs to be more specific.
unit of measurement
The exponent is a characteristic of a number. A measurement unit does not have an exponent. Since a metre is a measurement unit, it does not have an exponent.
Multiply
There is no such unit of measurement as a "decimal". The unit is therefore equal to itself in the same measurement.
Megabyte
Either the Hertz, the symbol per second, or the bit per second. And of course their multiples.
meters
The meter.
Amp
The basic unit of measurement for parallels of latitude is the degree. There are 180 degrees from the North Pole to the South Pole.
meter
No, it is a basic measurement unit.
the meter
The basic unit is a byte.
A kilogram is the base unit for mass in the SI system.
The basic unit of measurement in rhythm.
The basic measurement unit is a metre.