Is 45 a prime number?

No, 45 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.

Why 45 is not prime

45 has divisors other than 1 and itself. The smallest is 3: 45 ÷ 3 = 15.

Prime factorization: 45 = 3 × 3 × 5 = 3² × 5.

Quick facts about 45

• Even or odd: odd.
• Nearest primes: 43 below and 47 above.
• Primes up to 45: 14.

Is it prime? Nearby numbers

More about 45: factors of 45 · 45 squared · square root of 45 · 45 in binary · 45 in Roman numerals.

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