What number is considered an imperfect square?

Imade a fort for my pet gorilla by connecting two boxes. the first box is 555 meters long, 999 meters wide, and 999 meters high. the second box is 333 meters long, 888 meters wide, and 222 meters high.how many cubic meters of space does my gorilla have to play in her fort?

Which statement about perfect cubes is true

Plz ( true - false) all triangles have interior angles whose measure sum to 90.