Yes, 45 is an integer number. An integer is a whole number that can be positive, negative, or zero, and it does not have any decimal or fractional parts. In this case, 45 is a positive whole number, making it an integer.
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A negative Number
45 is real, rational, whole, natural, odd, composite, and an integer.
45 is an integer which is a rational number. So the question makes no sense.
Indeed, 45 is a composite number. Its positive integer factors are 1, 3, 5, 9, 15, 45.
If you mean 45 then it is a composite number because it has more than two factors