'Zero' is the only one.
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The number is 11
It will be the square root of 252
One.
If the length and width of a rectangle are multiplied by the same number, then . . . -- the perimeter is multiplied by the same number -- the area is multiplied by the square of the numbner
The number zero! Multiplied by itself = 0 x 0 = 0 Added to itself = 0 + 0 = 0!