You can convert miles to km, or square miles to square kilometers. You can't convert square units to linear units.
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1 sq km = 100 hectares. 1 sq mile = 2.59 sq km so 509 hectares = 5.09 sq km = 1.97 sq mile. You might also like to remember that 1 sq mile = 640 acres, and 1 hectare = 2.47 acres
1 mile = 0.6213711 km (rounded) (1 mi x 1 mi) = 1 sq mile = (0.621371 km x 0.621371 km) = 0.386102 sq km(rounded)
Land Area, 7,836 sq mi (20,295 sq km). Total Area, 8,729 sq mi (22.608 sq km)
Answer: 8951 km² = 3,456 mi²
809,444 km² or 312,528 sq miles.