There can be no conversion. A kilometre is a measure of length in 1-dimensional space while a square metre is a measure of area in 2-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempts at comparisons or conversions between the two are fundamentally flawed.
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1 square kilometer is 1000000 square meters.
Since each kilometer = 1000 meters, one square kilometer = 1000 X 1000 = 1 million square meters.
1 kilometer = 1,000 meters (1km x 1 km) = 1 km2 = (1,000m x 1,000m) = 1,000,000 m2 (one million square meters)
There are 100 meters in 0.1 kilometers. 0.1 kilometers x 1000 meters/1 kilometers = 100 meters 1 kilometer = 1000 meters
Well, darling, 400,000 square meters is equal to 0.4 square kilometers. So, to answer your question, there are 0.4 squared kilometers in 400,000 square meters. Math doesn't have to be a headache, honey!