It is a hectare.
Fun fact: There are 100 hectares in a square kilometer, and 640 acres in a square mile. A kilometer is about 0.62 miles, so a sq km will be about 0.62^2 = .3844 square miles. 640*0.3844 = about 246 acres in a sq. km. 246/100 = about 2.5 acres in a hectare.
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1 square centimeter = 1.0e-8 square hectometer
The SI unit of area is the square metre (m2), so as a hectometre is 100 metres, a square hectometre is 100m2, it doesn't need another name. Before the rationalisation of the metric system to SI units in 1960 the unit of area was the are, the are was equal to 100m2.
a hectometer
1 hectometer=100 meters
A square is a regular 4 sided quadrilateral