If you are using the red brick which are 4" x 8" you will need 4.5 bricks per square foot (just call it five.) 5 x 400 is 2000 bricks.
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400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
It depends on the size of the bricks and their orientation.
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A "45-ft vegetable garden" seems to be so skinny that perhaps it could be surrounded by a single row of 90 bricks.