A meter is a unit of length, a hectare is a unit of area. You can't convert that. A hectare, however, has 10,000 square meters.
The question should be, "How many square meters make a hectare?"A hectare is a unit of area equal to 10,000 square meters.
One hectare = 10,000 square meters
10,000 square metres equals 1 hectare. Cubic metres would define a 3 dimensional object which a hectare does not describe.
A metre is a unit of distance. A hectare is a unit of area. The two units are therefore incompatible.