Yes, it is a real number.
Yes, Any real number squared is a real number. In this case that number is 25.
18
18^2=324
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.
Yes, it's 400.
There are infinitely many such numbers. One such is 181.81828384881882883884...
18 squared is 32419 squared is 36120 squared is 400
18 squared is 324.
18 does.
Yes, Any real number squared is a real number. In this case that number is 25.
12 squared plus 18 squared is equal to 468.
not in the real world. The area of a square = The length of a side, squared. Any number squared is positive.