1,000
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The numerical meaning of the SI prefix "kilo" is 1000. It represents a factor of 10^3 (10 raised to the power of 3). For example, one kilogram is equal to 1000 grams.
No, a kilometer is 1000 meters (kilo is a Greek prefix used by SI for one thousand. Mega is the prefix for one million)
Deci is the si prefix for one tenth, eg. a decilitre is 0.1litre. It's not really used much, most si units stick to thousands; milli, micro, kilo, mega.
The prefix is milli, abbreviated "m".
There is no special SI prefix for the number 3.
The SI unit of mass is the kilogram, kg.