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Which of the following numbers is not a square?

(A) $1^6$ (B) $2^5$ (C) $3^4$ (D) $4^3$ (E) $5^2$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project. Solutions are the publisher's, linked not copied.