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Among the prime numbers, which one is the only even prime?

A3
B5
C2
D9
Answer & Solution
Correct answer: C. 2
1. Every even number greater than 2 is divisible by 2 as well as by itself, giving it a third factor. 2. That extra factor disqualifies every even number greater than 2 from being prime. 3. Only 2 itself is both even and prime, since its only factors are 1 and 2. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.1 Introduction to Whole Numbers_
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