There is no equivalence.
A kilometre is a measure of length or distance in 1-dimensional space while a square kilometre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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A square kilometer is a square that measures 1 kilometer by 1 kilometer
its 2.3567456
One kilometer = 1 000 meters One square kilometer = 1 000 000 square meters
A kilometer is a distance, A distance of 1 kilometer.A square kilometer is an area that has a boundry around it that is 4 kilometers long
Since each kilometer = 1000 meters, one square kilometer = 1000 X 1000 = 1 million square meters.