It is not the square of a whole number; but it is the square of a real number. If you calculate the square root of 23, you will get a real number. That real number times itself will equal 23. But the square root will not be a simple whole number. It will have an endless decimal fraction.
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No it is 23
25, which is five squared, is the first square number greater than 23.
x is an irrational number
Assuming you are referring to the 23rd squared integer, the answer is 23*23 = 529
46 squared + 23 squared = the resultant displacement squared. Pythagoras' theorem.