Is 81 a square number?
The questions are: Is 81 a perfect square and is 81 a square number?
Here we will answer the question. Is 81 a square number? You could also ask
is 81 a perfect square? Square number and perfect square mean the same thing.
Anyway, for 81 to be a square number, 81 must be the product of an
integer multiplied by itself. In other words, the square root of 81 must equal
a whole number (integer).
There is a number that multiplied by itself will equal 81. Furthermore, the square root of 81
is a whole number. 9 x 9 = 81 and the square root of 81 is 9. Thus, 81 is a square number.
The answer to the question: "Is 81 a square number?" is YES.
The answer to the question: "Is 81 a perfect square?" is also YES




