There are two simple methods to determine whether a number is even or odd: Divisibility Rule of 2: If a number leaves no remainder when divided by 2, it is an even number Digit Inspection: If the last digit of a number is 0, 2, 4, 6, or 8, it is an even number. Conversely, if the last digit is 1, 3, 5, 7, or 9, it is an odd number.