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Wolfram | Alpha: Acres per square mile? (oddities)


Just out of curiosity (and a current need for info) (and to start 
learning about W|A), typed:
 
   Acres per square mile

into Wolfram | Alpha. Results came back (had to do a little hand editing 
of the following):

      Assuming U.S. acres for "acres" 
   Use 
      international acres
      commercial acres
      Irish acres
      Hungarian acres
   instead

   Input interpretation:

      acres/mi^2

   Unit conversions:

      0.3861 acres per square kilometer
 
      6.323 square meters per acre
 
      0.1563 hectares per square kilometer
 
      0.4047 hectares per square mile
 
      0.003861 acres per hectare

Don't see "640" there anywhere! -- and something seriously wrong with 
that first unit conversion? (not to mention all the others) -- or at 
least the way it's phrased -- more like 250 acres per square kilometer?

Went to M7, tried

      Needs["Units`"]
      Convert[Acre, Mile^2]

            Mile^2/640

Went to Units Tutorial:  Seems odd to see "Centimeter", "Meter", 
"Micron", "Mile", and a bunch of arcane units listed there -- but NOT 
"Kilometer"???  ("Gram" and "Kilogram" are in there).


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