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The perfect squares that are less than 20 are 0, 1, 4, 9, and 16.
Any number squared except 0 is a perfect square so it follows that prime numbers are less common than perfect squares.
six
To find the perfect squares between 20 and 150, we need to determine the perfect squares less than 20 and the perfect squares greater than 150. The perfect squares less than 20 are 1, 4, 9, and 16. The perfect squares greater than 150 are 169 and 196. Therefore, there are 5 perfect squares between 20 and 150: 25, 36, 49, 64, and 81.
99, because 100 squared is 10000 and since it has to be less than 10000, it is 99.