11.56
It's (3.4)2 .
There are an infinite number of others.
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130
The square numbers closest to 99 and 149 are 100 (10^2) and 144 (12^2), respectively. The square number between 100 and 144 is 121 (11^2), as it falls between the square roots of 100 and 144. Thus, the square number between 99 and 149 is 121.
There are two, actually - 121 and 144. 121 is 11 x 11, and 144 is 12 x 12.
They are from 11 squared to 22 squared making a total of 12 square numbers between 100 and 500
11 and 12