This question cannot be answered sensibly. A square kilometre is a measure of area, with dimensions [L2]. A kilometre is a measure of distance, with dimensions [L]. The two measure different things...
214 square kilometres and 453 square kilometres
27,750
None. A km is a measure of length whereas a square kilometre is a measure of area. There is no direct conversion between the two.
603,700 square kilometres (233,100 sq mi) and with a coastline of 2,782 kilometres (1,729 mi)