Is 729 a prime number?
No, 729 is not a prime number. It is divisible by 3: 729 = 3 × 243.
Is 729 prime?
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A prime number has exactly two factors: 1 and itself.
- 2
It is enough to test the primes up to √729 ≈ 27.00. If none of them divides 729, it is prime.
- 3
3 divides 729 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 729 = 3^{6} \]Testing 729 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 729 ÷ 2 | leaves 1 |
| 3 | 729 ÷ 3 | divides exactly (243) |
| 5 | 729 ÷ 5 | leaves 4 |
| 7 | 729 ÷ 7 | leaves 1 |
| 11 | 729 ÷ 11 | leaves 3 |
| 13 | 729 ÷ 13 | leaves 1 |
| 17 | 729 ÷ 17 | leaves 15 |
| 19 | 729 ÷ 19 | leaves 7 |
| 23 | 729 ÷ 23 | leaves 16 |
Questions
Is 729 a prime number?
No, 729 is not a prime number. It is divisible by 3: 729 = 3 × 243.
What is the next prime after 729?
733.
What is the prime number before 729?
727.
What are the factors of 729?
1, 3, 9, 27, 81, 243, 729.