The number 20 is.
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It is: 90
Such a number does not exist. 3600 is 60 squared and 4900 is 70 squared There is no number between 60 and 70 that is a multiple of 15 so there can be no square between 3600 and 4900 that is a multiple of 15.
15 and any odd multiple of 15.
60
It is 19