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The only number in that list which is not a square number is 27. 27 is a cube number.

Q: What is the odd number out 16 36 64 27 81?

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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.

There are two 36's, so the odd one out is 36.

45

33

41 is the only odd number in this list

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27 and 81

64 is a multiple of 16, and 81 is a multiple of 27, so I'd say that 36 is the odd one out.

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