Is 1389 a prime number?
No, 1389 is not a prime number. It is divisible by 3: 1389 = 3 × 463.
Is 1389 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 √1389 ≈ 37.27. If none of them divides 1389, it is prime.
- 3
3 divides 1389 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 1389 = 3 \times 463 \]
Testing 1389 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 1389 ÷ 2 | leaves 1 |
| 3 | 1389 ÷ 3 | divides exactly (463) |
| 5 | 1389 ÷ 5 | leaves 4 |
| 7 | 1389 ÷ 7 | leaves 3 |
| 11 | 1389 ÷ 11 | leaves 3 |
| 13 | 1389 ÷ 13 | leaves 11 |
| 17 | 1389 ÷ 17 | leaves 12 |
| 19 | 1389 ÷ 19 | leaves 2 |
| 23 | 1389 ÷ 23 | leaves 9 |
| 29 | 1389 ÷ 29 | leaves 26 |
| 31 | 1389 ÷ 31 | leaves 25 |
| 37 | 1389 ÷ 37 | leaves 20 |
Questions
Is 1389 a prime number?
No, 1389 is not a prime number. It is divisible by 3: 1389 = 3 × 463.
What is the next prime after 1389?
1399.
What is the prime number before 1389?
1381.
What are the factors of 1389?
1, 3, 463, 1389.