Factors of 63
There are 6 factors of 63 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 63
1, 3, 7, 9, 21, 63
Factor pairs of 63
- 1 × 63
- 3 × 21
- 7 × 9
Prime factorization of 63
63 = 3² × 7
Number facts
- 63 is a composite number.
- 63 has 6 factors.
- 63 is not a perfect square.
- The sum of all factors of 63 is 104.
Divisibility rules that apply to 63
- 63 is divisible by 3 because the sum of its digits (9) is divisible by 3.
- 63 is divisible by 9 because the sum of its digits (9) is divisible by 9.
Check another number
How the factors of 63 are calculated
To find the factors of 63, every whole number from 1 up to the square root of 63(about 7.94) is tested for even division. 63 is odd, and it divides evenly by 3, 7, 9, 21. Written as a product of primes, 63 = 3² × 7, which confirms every factor above is a combination of those prime building blocks.
Frequently asked questions about 63
How many factors does 63 have?
63 has 6 factors: 1, 3, 7, 9, 21, 63.
Is 63 a prime number?
No. 63 is composite because it has factors other than 1 and itself.
What are the factor pairs of 63?
The factor pairs of 63 are 1 × 63, 3 × 21, 7 × 9.
What is the prime factorization of 63?
The prime factorization of 63 is 3² × 7.