Do the math yourself - There are 640 acres to One Square Mile
553 Million Acres == 864,062.5 SQUARE MILES
The square root gives the 'unsquared' mileage for the sides of an area that large.
Øbama’s Historic Land Grab: 553 Million Acres For ‘Conservation’
... That makes a total of 553 million acres of national lands and waters that Obama has repurposed for conservation and protection using the 1906 Antiquities act, more than any other president, according to the New York Times. More than 80 percent of Nevada and about 65 percent or Utah is owned by the federal government, according to National Public Radio. ...
http://www.breitbart.com/big-government/2016/12/29/obamas-historic-land-grab-553-million-acres-conservation/

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