Yes they are.
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1200 square km=1200 square km
No, 2km=2km 2kmsquared=4km A square kilometer is formed when you square the kilometer in this case 2kmx2km=4
510,066,000 square km = 196,937,583.6 square miles (rounded)
The perimeter of a square with 6 km sides is 24 km
A mile is not a measure of an area so, as asked, the question has no answer. Unfortunately, 150 km squared is ambiguous since it could refer to an area of 150 square kilometres (say 10 km by 15 km) OR an area of the square with sides of 150 km. 150 square km = 57.92 square miles 150 km square = 22500 square km = 8687.3 sq miles = 93.21 miles square.