One square mile is 2.6 (2.58999) square kilometers.
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1 mile = 1.609 kilometers, so 1 square mile = 1.609 x 1.609 km2 = 2.59 km2
Answer: 1 mi² = 2.58998 km²
1 square mile is equal to approximately 2.59 square kilometers.
1 US mile is approximately equal to 1.609 kilometers.
One British mile is approximately equal to 1.609 kilometers.