No, 4.5 is not an integer.
No.
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45 is an integer, not a fraction.
what is the sum of the first 10 positive integers? To me, if you include 0 as the first integer, then the tenth integer is 9 and the sum is 45. If you don't include 0, the tenth integer is 10, and the sum is 55.
It is a composite number because it has more than two factors
The positive integer factors of 405 are: 1, 3, 5, 9, 15, 27, 45, 81, 135, 405
No, it is an integer.