106 x 106 = 1012 ie 1 followed by 12 zeroes
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1 sq kilometer = 1000000 sq meters
The answer will depend on the units used for 1000000.
100cm squared = 0.01 metres squared
5x squared
1000000 is bigger because 100x1000 (since a kilometer is 1000 meters) is 100000 which proves 1000000 meters is bigger than 100 km