1,4,9. Any number that is an integer squared. So 2x2 is a perfect square. Any whole number times itself.
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Yes, in so far as all numbers are squares (of some number). But 90 is not a perfect square.
The perfect squares less than 101 are: 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100
Only one - 16
101
If you're talking about a perfect circle and perfect squares, I would say probably about 3.1415926 squares would fit into a circle. So, about 3: but a little more. - Josh