None, since there can be no conversion. A square mile is a measure of area in 2-dimensional space while a mile cube is a measure of volume in 3-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
1500 sq. ft = 1,393,546 sq. cm.
214 x 7 sq feet in 1500 sq feet with a remainder of 2 sq feet.
65,795 sq. miles.
595,391 sq. miles
260,558 sq miles
59425 sq miles
260,558 sq miles
1,250 sq miles = 2,011.7 sq kilometres
Rhode Island is the only place that comes close to 1500 square miles in a distance of 1,545 square miles (4,001 sq km).
Europe - 3,930,000 sq miles.
Newfoundland - 156,453 sq miles
7890965 sq miles 7890965 sq miles