You cannot. Pound is a measure of mass or of a currency value. A square is (presumably) some measure of area (in unspecified units). 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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lb is a weight, square yards is an area, they can't be converted
15 lb. has 400 sq. ft. 30 lb. has 200 sq. ft.
To convert from lb/sq. in to kg/sq. cm multiply by 0.0704. (As lb = 0.454kg, sq. in = 6.452 sq. cm and so lb/sq. in = 0.454/6.452 = 0.0704 kg/sq. cm)
If the cubic prism has length L, breadth B and height H, then its surface area is 2*(LB + BH + HL) square units.
15 lb. 400 sq. ft. 30 lb. 200 sq. ft.