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Square yards is a measure of area, you need to purchase your sand as a volume not an area. You will need 2000 cubic feet of sand.
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A square yard of anything is 9 square feet.
A 2500 square foot area x 4' deep is 10000 cubic feet. So you need 10,000 cubic feet of sand. Dry sand has a density of 80-100 pounds or so per cubic foot, so that's somewhere between 800,000 and a million pounds of sand.
The answer will depend on how deep the cement needs to be.