Divisor/dɪˈvaɪzər/ Definition 1 of 2Pro Tip 1/3Math Operations Remember, 'divisor' is used in division, one of the four basic arithmetic operations. Determine the divisor in this equation: 20 ÷ 4. Pro Tip 2/3Not a Dividend 'Divisor' should not be confused with 'dividend', which is the number being divided. In 8 ÷ 2, 8 is the dividend and 2 is the divisor. Pro Tip 3/3Checking Divisibility Use 'divisor' to discuss whether one number can be evenly divided by another. Is 3 a divisor of 9? Yes, because 9 ÷ 3 equals 3 with no remainder.