no
23 is a Prime number
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The square root of the number 23 = ± 4.795832
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.
No. Such a number is referred to as a perfect square. The closest perfect square to 23 is 25, the square root of which is 5.
No. Square root of 23 is irrational.
25, which is five squared, is the first square number greater than 23.