lolwut??
The base of a square pyramid is the only face that is a square - all the others are triangular in shape. So you do not need any measurements to determine which is the base.
All numbers have factors. Some factors are perfect squares. We call these perfect square factors. 9 is a perfect square factor of 27.
No.
It is a perfect square.
Yes, in so far as all numbers are squares (of some number). But it is not a perfect square.
No, 8 is a multiple of 4 and NOT a perfect square.
No.
No they have to have a polygon as a base.
No. The square roots of perfect squares are rational.
No. 4/9 is not a perfect square but radical(4/9) = 2/3 is rational.
It is a rational number - as are ALL perfect squares.
1501