No, 1.5 is not a whole number.
Whole numbers are defined as non-negative integers starting from zero, which include 0, 1, 2, 3, and so on, without any fractions or decimals. Since 1.5 contains a decimal, it is classified as a decimal number. In the context of number sets, whole numbers do not include fractions or decimals; therefore, 1.5 falls outside this category.