1. The problem asks: Is 0 a number? 2. In mathematics, a number is a mathematical object used to count, measure, and label. 3. Zero (0) is a number that represents the absence of quantity or a null value. 4. It is an integer and is considered a whole number. 5. Zero plays a crucial role in arithmetic as the additive identity, meaning for any number $a$, $a + 0 = a$. 6. Therefore, 0 is indeed a number, specifically an integer and a whole number. Final answer: Yes, 0 is a number.