Yes, -19 is an integer. An integer is any whole number, whether positive, negative, or zero. In this case, -19 is a negative whole number, making it an integer.
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Yes
It is 18 or 20
33
The answer is 19.
Yes. The prime factors of 38 are 2 and 19. Division by any integer other than 1, 2, 19, or 38 (or -1, -2, -19, -38) will not yield an integer answer.