least prime number
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1
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2
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3
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None of the above
Reveal answer
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B
Correct answer
Explanation
2 is the least prime number because it is the smallest positive integer with exactly two distinct divisors (1 and itself). 1 is not prime by definition as it has only one divisor.
AI explanation
A prime number must have exactly two distinct positive divisors, 1 and itself. The number 1 only has one divisor (itself), so it doesn't qualify as prime, and 2 is the smallest number with exactly two divisors, making it the smallest prime — and notably the only even prime.