Common EntranceQuantitative ReasoningOdd Number Out

Which number is the odd one out: 16, 25, 36, 48, 64?

A16
B48CORRECT
C64
D25
AI
Toaster Teacher
Why the answer is B, and why the others tempt you.
16, 25, 36 and 64 are square numbers; 48 is not a square number.
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