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The prefix kilo- means one thousand: 1000
The prefix milli- means one thousandth: 1/1000 = 0.001
1000 > 0.001 → kilo- > milli-
→ kilometer is greater than millimeter.
A kilometer is one million times larger than a millimeter.
Neither.
A km is a kilometer, or kilo-meter. Kilo means 1,000, thus 1,000 meters. An mm, or millimeter is 1/1,000 of a meter. They are related in that they are the conjugate of each other: km= 1,000 m, mm= 1/1,000 m.
The centimeter is smaller than the kilometer.
kilometer(km) 1E-6 meter(m) 0.001 decimeter(dm) 0.01 centimeter(cm) 0.1 millimeter(mm) 1 micrometre (micron) 1000 nanometer(nm) 1000000 angstrom 10000000