Answer: 1 mi² = 2.58998 km²
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One square mile is 2.6 (2.58999) square kilometers.
1 mile = 1.609 kilometers, so 1 square mile = 1.609 x 1.609 km2 = 2.59 km2
To convert square kilometers to square miles, multiply by 0.3861. So, 5.73 square kilometers is approximately 2.21 square miles.
1 square mile is equal to approximately 2.59 square kilometers.
A square mile is equivalent to 640 acres or 2.59 square kilometers. It is a unit of area that measures one mile by one mile, totaling 4,014,489 square meters.