Multiple choice general knowledge math & puzzles Smallest 3 digit prime number is? 103 107 109 None Reveal answer Fill a bubble to check yourself D Correct answer Explanation The smallest 3-digit number is 100. Checking numbers upwards: 101 is prime. Since 101 is not listed in the options (103, 107, 109), 'None' is the correct choice. 103, 107, and 109 are primes, but they are larger than 101.