1 km2 = 1.000.000 m2, because 1 km = 1000 m --> 1^2 = 1 & 1000^2 = 1.000.000. I hope that this will be the answer that you were looking for.
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1 km2 = 1 000 000 m2.
1 000 000 000 000 mm21 km2 = 1 000 000 m21 m2 = 1 000 000 mm2therefore 1 km2 = 1 000 000 000 000 mm2
1 ha = 10.000 m2
1 m2 = 1,000,000 mm2
1 hectare = 10000 m2