818 is not a perfect square, so the number that gives you 818 when squared will not be an integer.
818 = 2 * 409 (409 is prime)
282 = 784
x2 = 818
292 = 841
x = √(818)
x ≈ 28.6007
A number squared gives a squared number (this is what the result is called), which I think is what you are asking.
That all depends on what you do to the number.
-9 or +9.
5
818 is a composite number because it is an even number greater than 2.
The answer is 4 squared minus 2 squared as 4 squared is 16 minus 2 squared, which is 4, gives you 12 as an answer.
Either 6 or -6 will satisfy this.
111,111,111 squared equals 12,345,678,987,654,321
64 squared gives 4,096
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70
That doesn't really make sense. If you figure out the square root of the number, the whole point is to find a number which, when squared, gives you back the original number. Therefore, there is no such thing as a "square root that can't be squared".