There is no equivalence.
A millimetre is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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9.514 x 106 feet
2900 feet is a little more than 1/2 mile.
A foot and an inch are units of distance. A square millimetre is a unit of area. The two units are therefore incompatible.
There is one trillionths of one square kilometre in a square millimetre.
There are 0.003281 feet in 1 millimeter.1 millimetre = 0.00328 feet.