No. A square number is one that has an integral as its square root. For example, 9 is a square number because 3 x 3 = 9. There is no whole number that gives you 11 when multiplied by itself.
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It is: 11*11 = 121
It is: 11*11 = 121
11 x 11 = 121. Any integer multiplied by itself results in a square number.
It is a cubed number because 11*11*11 = 1331
The square root of 121 is 11, and 11 is a rational number.