No, 0.5 is not a whole number.
Whole numbers are defined as the set of non-negative integers, which includes 0, 1, 2, 3, and so on. They do not include fractions or decimals. Since 0.5 is a decimal fraction that represents half of one, it falls outside the category of whole numbers. Whole numbers are always complete units, and 0.5 represents a value that is between 0 and 1, making it a rational number but not a whole number.