A hectare is a unit of area, a kilometer is a unit of length, so you can't compare them. A SQUARE kilometer is equa to 100 hectares.
Since a square kilometer = 100 hectares, a hectare = 0.01 square kilometers.
1 hectare is 0.01 square kilometer.
There are 0.01 square kilometers in 1 hectare.
Please restate the question. The question in its current form is not one that can be answered as kilometer is a measurement of length (1000 m = 1 kilometer) whereas hectare is a measurement of area ( 10000 m^2 = 1 hectare ). If the question was proposed as: How many hectares are in an area of a square with sides of 1 kilometer? Answer is 100 hectares.
Hectare x 10,000 = square meters
hectare x 10,000 = square meters
If there were any such thing as a square hectare it would measure the hyper-volume of a 4-dimensional object. How you calculate this would depend on the shape of the object. A really easy one would be a hypercube of side 100 meters; this would have a hypervolume of 1 square hectare, or 108 m4. The other answer to this question is that a hectare is already a measure of area; a hectare is 10,000 square meters, or about 2.4 acres. In our normal three dimensional world it makes no sense to square it; just the attempt could make your head hurt.
You can't convert that. A hectar is a unit of area; a kilometer is a unit of length.
50 hectare is 500,000 square meters (hectare x 10,000 = m2)
One square kilometer is 100 hectares.
There are exactly 0.01 square kilometers in 1 hectare. In contrast, there are exactly 100 hectares in 1 square kilometer.