You might be thinking of proper factors. Proper factors are just like the set of regular factors, except for 1 and the number itself.
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No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. Composite numbers are numbers with more than 2 factors and more than 1 proper factor. Prime is the opposite of composite.
Some rational numbers are whole numbers, some are not. The set of whole numbers is a proper subset of rational numbers.
They are not. Counting numbers are a proper subset of whole numbers. Negative integers (-1, -2, -3 etc) are whole numbers but they are not counting numbers.
Mixed numbers are larger than proper fractions.
They form a proper subset of rational numbers.