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The smallest 3 digit prime number is:

101
103
109
113
Explanation:

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

$\therefore$ 100 is not a prime number.

$ \sqrt{101} $ < 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.

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