A square yard is a measure of area in 2-dimensional space. 600 square feet 4 inches thick is a measure of volume in 3-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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23.67 square yards
720 square inches = 5 square feet = 5/9 of a square yard.
.617 Yards
259.2593 sq. yards.
270 square feet.