Define Integer: Define what an integer is.An integer is any whole number, including negative numbers, 0, and positive numbers, without any fractional or decimal part.
Check 3 as Integer: Determine if 3 is a whole number without any fractional or decimal part.3 is a whole number and does not have any fractional or decimal component.
Compare 3 to Definition: Compare 3 to the definition of an integer.Since 3 is a whole number and fits the definition of an integer, we can conclude that 3 is indeed an integer.