The smallest 3-digit prime number is: (1) 100 (2) 101 (3) 103 (4) 109

Prime numbers are the numbers that have only two factors, that are, 1 and the number itself.

Answer: 101 is the smallest 3-digit prime number.

Let's find the smallest 3-digit prime number.

Explanation:

The smallest 3-digit number is 100 which is divisible by 2,4.. etc.

Hence, 100 is not a prime number.

Let's consider 101.

101 is not divisible by any of the prime numbers 2, 3, 5, 7...

Hence, 101 is a prime number.

Thus, 101 is the smallest 3-digit prime number.