This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A millimetre (mm) is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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3,500 mm = 37,673.7 ftft
1 sq ft = 92903 sq mm
8 ft * 4 ft * 6 mm = 64 sq ft * 8 mm = 5.95 sq metres * 0.008 m = 0.048 m3.
20 sq cm = 20*100 sq mm = 2000 sq mm
5220.5 sq ft