1 sq km = 1,000,000,000,000 sq mm
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The prefix "kilo" means thousand, so a kilometer has 1000 meters. Therefore, the SQUARE kilometer has a million (a thousand squared) square meters.
There are 1000000 millimeters in one kilometer so that means you have to divide your milliometers by 1000000 [EXAMPLE] 3950000000mm/1000000=3950km
There are 100,000 centimeters in one kilometer.
One thousandth of kilometer makes one meter
1 kilometer = 10 hectometers