64 is a multiple of 16, and 81 is a multiple of 27, so I'd say that 36 is the odd one out.
Square numbers 16, 25, 36, 49, 64, 81, 100
It's even
456445
25 is odd
64 is a multiple of 16, and 81 is a multiple of 27, so I'd say that 36 is the odd one out.
The only number in that list which is not a square number is 27. 27 is a cube number.
27 because all the others are square numbers
27 and 81 are the odd numbers. Since odd numbers are 1, 3, 5, 7 and 9, look at the last number and you will be able to tell if it's odd or even.
27 is not a perfect square
27 because it doesn't have an even square root. 42=16 - 62=36 - 82=64 - 92=81
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
There are two 36's, so the odd one out is 36.
Square numbers 16, 25, 36, 49, 64, 81, 100
45
Square numbers like 1, 4, 9, 16, 25, 36, 49, 64, 81, 100
It's even