You don't, because they don't measure the same kind of thing.
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1 square kilometer is 1000000 square meters.
To convert from square miles to square km, multiply by 2.59.
Multiply by one million ! There are one million square metres in a square kilometre.
1km = 1000m 1 sq km = 1km x 1km = 1000m x 1000m = 1 000 000 sq m Thus to convert meter square to kilometer square divide by 1 000 000 (a million)
A hectar is a unit of area, a kilometer is a unit of length, so you can't convert that. A square kilometer has 100 hectars.