100
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Smallest 3 digit whole number is 100 or -100
Referring to only positive integers, the smallest composite number is 4 (2 x 2). A composite number is any number that is the product of two or more prime numbers.*Referring to all integers, it would be the negative number -9, (3 x -3), which is the also the arithmetically lowest one-digit number. However, under normal definitions, negative numbers are not considered prime or composite numbers.
100 is the smallest 3-digit natural number.
101 is the smallest odd 3-digit number.
The smallest three digit number is 100.