" Kilometer " (km) is a unit of length or distance, as of a finger, a piece of rope, or a trip to the moon.
" Square kilometer " (km2) is a unit of area or coverage, as of a bedroom floor, or a plot of land.
The two units have different 'dimensions' and are used to measure different quantities. Neither of them can be converted into the other one. That would be like trying to tell me your age in gallons.
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4 km2
23 km * 23 km = 529 km2
Total area = 17.1 million km2 of which, land = 16.4 m km2 and water = 0.7 km2 Source: The World Factbook, CIA.
convert 15 nm into km
1000 meters is 1 km 1 km2 = 1000x 1000 = 1,000,000 meter2