Is 1143 a prime number?
No, 1143 is not a prime number. It is divisible by 3: 1143 = 3 × 381.
Is 1143 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 √1143 ≈ 33.81. If none of them divides 1143, it is prime.
- 3
3 divides 1143 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 1143 = 3^{2} \times 127 \]Testing 1143 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 1143 ÷ 2 | leaves 1 |
| 3 | 1143 ÷ 3 | divides exactly (381) |
| 5 | 1143 ÷ 5 | leaves 3 |
| 7 | 1143 ÷ 7 | leaves 2 |
| 11 | 1143 ÷ 11 | leaves 10 |
| 13 | 1143 ÷ 13 | leaves 12 |
| 17 | 1143 ÷ 17 | leaves 4 |
| 19 | 1143 ÷ 19 | leaves 3 |
| 23 | 1143 ÷ 23 | leaves 16 |
| 29 | 1143 ÷ 29 | leaves 12 |
| 31 | 1143 ÷ 31 | leaves 27 |
Questions
Is 1143 a prime number?
No, 1143 is not a prime number. It is divisible by 3: 1143 = 3 × 381.
What is the next prime after 1143?
1151.
What is the prime number before 1143?
1129.
What are the factors of 1143?
1, 3, 9, 127, 381, 1143.