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1, 4, 9, 16, 25, 36, 49, 64, 81 .
No square number is a prime number, since it has the number you squared as a factor. There are several square numbers less than 100. Just calculate the squares of all numbers, starting with 1, until you reach or pass 100. Then stop.
81 is the largest square of a whole number...
9 is an odd square number less than 10 and 92 = 81 which is greater than 50
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