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)
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You can convert miles to km, or square miles to square kilometers. You can't convert square units to linear units.
One square kilometer is 0.386102 square miles. Therefore, 2.8 million sq km = 2,800,000 x 0.386102 = 1,081,085.6 square miles.
Hiroshima's total area is 349.4 sq miles (905 km²).
Answer: 8951 km² = 3,456 mi²
809,444 km² or 312,528 sq miles.