An integer is a whole number that can be positive, negative, or zero. Whole numbers are the numbers 0, 1, 2, 3, 4, and so on (they go on forever). Negative numbers are the numbers -1, -2, -3, and so on (they go on forever in the negative direction). Zero is neither positive nor negative. Is 2. 5 an integer number? 2.5 is not an integer number. Is a negative number an integer? A negative number is not an integer. An integer is defined as a whole number, which means it cannot be a fraction or a decimal. A negative number is neither of those things. Is 0 an integer yes or no? Yes, 0 is an integer. It is the smallest integer, and is equal to the number 0 on the number line. How do you identify integers? The set of integers is a subset of the set of real numbers, which consists of all the numbers that can be represented on a number line. Integers are the numbers that fall within the set {...,-3,-2,-1,0,1,2,3,...}. Is 2 a integer number? Yes, 2 is an integer.