Find the odd number / letters / word from the given alternative:

144
168
196
256

The odd number is 144.

All other numbers are perfect squares.

A perfect square is a number that can be obtained by squaring an integer.

144 is not a perfect square because it cannot be obtained by squaring an integer.

168 = 12^2
196 = 14^2
256 = 16^2

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