Now check if divisible by $9$: yes, as shown above.

Wed, 06 May 2026 07:05:26 +0000

# Check If a Number Is Divisible by 9: The Simple Rule You Need to Know Understanding divisibility rules can save time and simplify calculations—especially when dealing with large numbers. One of the most effective and widely used rules is determining if a number is divisible by 9. In this article, we’ll explain how to check divisibility by 9, why it works, and how to apply the rule quickly with clear examples. ## What Does It Mean to Be Divisible by 9? A number is divisible by 9 if the sum of its digits divided by 9 leaves no remainder—meaning the remainder is zero. This rule applies to any positive integer, making it a powerful mental shortcut in arithmetic, number theory, and daily calculations.