milli IS THE PREFIX
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km stands for "kilometer", and the prefix "kilo" means that you are supposed to multiply by 1000. Thus, to convert from km to meter, you multiply by 1000.
It means to multiply by one-thousandth (0.001).
The prefix "kilo" means x1000, so to convert kilometers to meters, you simply multiply by 1000.
It is a kilogram, because the prefix kilo- means "1000."
The prefix "kilo-" means 1000, so there are 1000 meters in a kilometer