Multiple choice general knowledge math & puzzles

Which number is Neither Prime nor Composite?

  1. 13

  2. 17

  3. 2

  4. 1

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

By definition, 1 is the only positive integer that is neither prime nor composite. 2, 13, and 17 are all prime numbers because they have exactly two distinct factors. 1 has only one factor.