What is 9?

9 is:

• A digit: It's the highest single-digit number in the decimal number system. You can find more about the decimal number system here: Decimal Number System.
• An integer: Specifically, a positive integer. See more about Integers.
• A composite number: Its factors are 1, 3, and 9. Learn more about Composite Numbers.
• Divisible by 3: 9 / 3 = 3. See Divisibility Rules.
• The square of 3: 3 * 3 = 9. You can see the importance of Squares in math.
• The sum of the first three positive integers cubed: 1³ + 2³ = 1 + 8 = 9.
• Often associated with completion or ending a cycle in numerology. Read more about Numerology.