The amount of gravel needed to cover 252 square feet depends on how thick (that is, deep) you want the gravel.
If you want the gravel to be 3 inches thick...
Convert the measurement to the same units. We'll use feet.
3 inches = 1/4 foot
Multiply the thickness times the area to get volume in cubic measure.
1/4 feet x 252 feet = 63 cubic feet
Gravel in the US is usually sold by the cubic yard, which is 27 cubic feet
Thus, 63/27 = 2 1/3 cubic yards
2 1/3 cubic yards of gravel will cover 252 square feet of area to a dept of 3 inches.
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You multiply 126 x 2 = 252
252/7 = 36
252 = 4*7*9 Sqrt(252) = 6*Sqrt(7), or 6*(7).5
252
The factors of 252 are 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126 and 252.