the only perfect square factor of 90 is 9
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90 is a not perfect square.
The square roots of 8100 are 90, -90
90 square meters could be 90 squares, each one meter on each side. 90 meters square would be a square that is 90 meters on each side. THAT would total 7,200 square meters.
A square, four equal sides with four equal 90 degree corners. 90 + 90 + 90 + 90 = 360 TRUE HAHA LOL
90 has three prime factors: 2, 3 and 5.