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Algebra Difficulty 1.0 Junior Find the answer Canada

Which one of the following statements is not true?

(A) $25$ is a perfect square. (B) $31$ is a prime number. (C) $3$ is the smallest prime number. (D) $8$ is a perfect cube. (E) $15$ is the product of two prime numbers.

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.