0
None.
A square kilometre is a measure of area. It has no thickness and so no volume. It cannot, therefore contain any atoms.
The number of atoms in a cubic kilometre will depend on whether you are talking about interstellar space, the earth's atmosphere, ordinary matter, a stellar core or a black hole. The answer will range from nearly zero to infinity.
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Continue Learning about Other Math
How many square kilometers in 1750000 square meters?
1.75 sq. km
How many square kilometers is Oregon?
254,805 km2
How many miles is 9.6 million square kilometers?
Answer: 9,600,000 square km = 5,965,163.445 square miles
How many sq km in 1 hectare?
1 hectare = 0.01 square kilometers
How many square kilometers is China?
China is between 9,596,961 to 9,639,688 sq. km.
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