Is 561 a prime number?

No, 561 is not a prime number. It is a composite number: its digits add up to 12, which is divisible by 3, so 561 is divisible by 3.

Why 561 is not prime

561 has divisors other than 1 and itself. The smallest is 3: 561 ÷ 3 = 187.

Prime factorization: 561 = 3 × 11 × 17.

Quick facts about 561

• Even or odd: odd.
• Nearest primes: 557 below and 563 above.
• Primes up to 561: 102.

Is it prime? Nearby numbers

Another number? Use the prime number checker for any value, or see the list of prime numbers.