Prime 59 is a number puzzle game where you fill a 6×6 grid using only prime numbers so that every row and column adds up to exactly 59.

What are prime numbers?

Prime numbers are numbers greater than 1 that can only be divided evenly by 1 and themselves. Examples include 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31.

Is Prime 59 free to play?

Yes! Prime 59 is free to download and play. A premium subscription unlocks additional features like advanced stats, unlimited daily challenges, and ad-free gameplay.

Is there multiplayer?

Yes! Battle Mode lets you challenge friends with a direct link or get matched with players worldwide. Both players solve the same puzzle in real-time.

What platforms is Prime 59 available on?

Prime 59 is available on iOS (App Store), Android (Google Play), and the web at prime59.fun. Your account syncs across all platforms.

Is 9 a Prime Number? A Clear Answer and Explanation

No, 9 is not a prime number. Its factorization is 9 = 3 × 3, so it is a composite number.

Why 9 Is Not Prime

A prime number has exactly two distinct divisors: 1 and itself. Since 9 can be divided evenly by 1, 3, and 9, it has three divisors. This means 9 does not meet the definition of a prime number.

Factorization of 9

The factorization of 9 is straightforward: 9 = 3 × 3. This means 3 is a factor of 9, and since 3 is not 1 or 9, this confirms 9 is composite. Listing out, the divisors of 9 are:

Prime vs. Composite Numbers

Prime numbers have exactly two divisors (1 and itself). Composite numbers have more than two divisors. Since 9 has three divisors, it is composite, not prime.

Sharpen Your Prime-Spotting Skills

If you want to get faster at identifying prime numbers like this, you can practice with Prime 59, a fast-paced game where you spot primes against the clock. It’s a fun way to improve your mental math and quickly recognize the difference between prime and composite numbers such as 9.

Train your eye for primes the fun way - Prime 59 is a free, race-the-clock prime-spotting game.

Try Prime 59

FAQ

Is 9 a prime number?

No, 9 is not a prime number. It has three divisors: 1, 3, and 9.

What is the factorization of 9?

The factorization of 9 is 3 × 3. This shows that 9 is composite.

Why isn’t 9 considered a prime number?

A prime number has exactly two divisors: 1 and itself. 9 has three divisors (1, 3, and 9), so it is not prime.

How can I get better at spotting prime numbers like 9?

You can practice by playing Prime 59, a game that challenges you to spot prime numbers quickly and sharpen your mental math.

What are the divisors of 9?

The divisors of 9 are 1, 3, and 9.