It is not possible to answer this question. 2600 feet by 4 inches deep is a two dimensional measure. You need a 3-d measure to calculate the amount of material required. Furthermore, the question does not say what material. A given volume of feathers, for example, will have a significantly smaller mass than the same volume of lead!
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You need to mention how deep you want the sand to be
55.56 cubic yards.
You need (182/3) divided by (cubic feet of mulch in each bag) bags.
if that is 3 ft deep it would require 96 yards... IF it is 3 inches deep it would require 24 cubic yards
That depends on how deep you want to spread it. To cover 600 square feet, you need (111/9) cubic yards for every 6 inches of depth.