Multiple choice general knowledge math & puzzles

Which of these is a prime number?

  1. 899

  2. 599

  3. 299

  4. 799
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

599 is a prime number because it has no divisors other than 1 and itself. Checking divisibility by primes up to sqrt(599) ≈ 24.5 (primes: 2, 3, 5, 7, 11, 13, 17, 19, 23) shows none divide 599 evenly. 899 = 29×31, 299 = 13×23, and 799 = 17×47 are all composite.

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