1. The problem asks: Is a whole number a natural number?\n\n2. Definitions:\n- Whole numbers are the set $\{0, 1, 2, 3, \ldots\}$.\n- Natural numbers are usually defined as $\{1, 2, 3, \ldots\}$, sometimes including 0 depending on the context.\n\n3. Important rule: In most common definitions, natural numbers start from 1, not 0. Whole numbers include 0.\n\n4. Therefore, every natural number is a whole number, but not every whole number is a natural number because 0 is a whole number but not a natural number.\n\n5. Conclusion: The statement "a whole number is a natural number" is false because 0 is a whole number but not a natural number under the common definition.