640 acres = 1 square mile
So we can say 1 acres = [tex] \frac{1}{640} [/tex] square mile
So in 2.2 acres = [tex]2.2 * \frac{1}{640} [/tex] square mile
= 0.0034375 square mile
In general one mile = 1609.344 meters
So one square mile = 1609.344 * 1609.344 square meter
= 2589988 square meter
So 0.0034375 square mile = 0.0034375 * 2589988
= 8903.08375 square meter.