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An integer is any whole number, positive, negative, or 0.

An '''integer''' is any whole number, positive, negative, or 0.  More precisely, the set of all integers consists of all natural numbers {1, 2, 3, 4, ...}, their negatives {-1, -2, -3, -4, ...} and 0.  A formal definition is that it is the only [[integral domain]] whose positive elements are well ordered and in which order is preserved by addition.

Some examples of intergers: 1, 10/5, 98058493, -87, -3/3, the square root of 9, and 0.

Some examples of integers: 1, 10/5, 98058493, -87, -3/3, the square root of 9, and 0.

The following numbers are not integers: 5/10, the square root of -9, 8.75, and Pi.

The following numbers are not integers: 5/10, the square root of -9, 8.75, and Pi.