Yes, it is.
Yes.
81 is the largest square of a whole number...
One hundred is ten squared = 102
Yes.
One hundred is the least three-digit square number. It is formed by 102.
The square root of 100 is 10, and it is a rational number.
36
1, 4, 25 and 100.
The square root of 163 is - approximately - 12.7671453348037 As this is a number which cannot be expressed as a fraction it is called an irrational number.
You write: eight hundred and eighty dollars. Always do it as close to the square where you write in the number and draw a line in front of the eight hundred. This way it can't be added to or changed to a higher number.
You probably mean greater than 400. 441 and 484 fit those conditions.