Question: is 2 divisible by 18?
Answer: 18 is divisible by 9 since 18 ÷ 9 = 2 with a remainder of 0. If one whole number is divisible by another number, then the second number is a factor of the first number. Since 18 is divisible by 9, 9 is a factor of 18. A divisibility test is a rule for determining whether one whole number is divisible by another.