1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400...
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Two. 36, and 49 are perfect squares.
The square root of every perfect square is an integer. However, there are also square roots of numbers that are not perfect squares.
Integers which are the squares of integers are called perfect squares or square numbers. Perfect squares less than 101 are 1, 4, 9, 16, 25, 36, 49, 64, 81 and 100.
64 is the square of 8 and the cube of 4.
The only squares of perfect squares in that range are 1, 16, and 81.