Question

The smallest 3 digit prime number is:

• A. $101$
• B. $103$
• C. $109$
• D. $113$

Answer 1

The correct option is A $101$

The smallest 3-digit number is $100$, which is divisible by $2$.
$\therefore$ $100$ is not a prime number.
$\sqrt{100}<11$ and $101$ is not divisible by any of the prime numbers $2,3,5,7,11$.
$\therefore$ $101$ is a prime number.
Hence $101$ is the smallest 3-digit prime number.