There are an infinite number of them. I'm quite busy just now, so I can
only give you the first few. They are 64, 81, 100, 121, and 144.
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positive square numbers less than 50 are 7 these are : 1,4,9,16,25,36,49.These are less than 50.
They are the numbers that have more than two factors in them.
There are 3 prime numbers between 40 and 50: 41 43 47.
16, 25 and 49.
Deductive reasoning. Trial and error. The square root of 49 is 7. The square root of 50 will be a little more than that. The answer is roughly 7.071