"Cubic inches" is a measure of volume (three-dimensional) while "square foot" is a measure of area (two-dimensional). Therefore, the two measurements cannot be equated.
However, you could ask "how many square inches are in one square foot?" Both measurements reference box (two-dimensional). The area is length times width, or one foot times one foot, or twelve inches times twelve inches. And 12 inches * 12 inches = 144 square inches.
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