Negative numbers are not integers. Thus, -2 is not an integer.
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It is positive as for example: -2*-2*-2*-2 = 16
Only if x is already an integer. For any integer x, 2x + 2 will be an even integer.
-2/3 is not an integer because it is a fraction.
50/25 simplifies to 2/1 which is 2 and 2 is an integer, so yes, 50/25 is an integer.
It is 2.