1 and 9
9. The square root of 81 is 9.
Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.
81
4,9,16,25,36,49,64,81
They are 'square' numbers. 6x6=36, 9x9=81 and 5x5=25. Some other square numbers are 64, 4, 9, 100 & 121
1 and 81 Those two numbers certainly divide into 81 though they are not the only numbers to do so.
Examples of such numbers are 49, where sqrt(49) = 7, 81, where sqrt(81) = 9. Such numbers are called square numbers.
81 because 9x9 equals81
81 and 4
64 and 81
25 and 81
64 , 81