It is an area equivalent to 1 million square metres.
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1012 or a trillion of them.
No, it is smaller. One square kilometer has 100 hectares.
A kilometre is a unit of distance. A square kilometre is a unit of area. The two units are therefore incompatible.
Kilometer is a measure of distance, square feet is a measure of area. They aren't compatible.
None. A kilometre is a measure of length 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, any attempt at conversion from one to the other is fundamentally flawed.