Is 1081 a prime number?
No, 1081 is not a prime number. It is divisible by 23: 1081 = 23 × 47.
Is 1081 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 √1081 ≈ 32.88. If none of them divides 1081, it is prime.
- 3
23 divides 1081 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 1081 = 23 \times 47 \]
Testing 1081 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 1081 ÷ 2 | leaves 1 |
| 3 | 1081 ÷ 3 | leaves 1 |
| 5 | 1081 ÷ 5 | leaves 1 |
| 7 | 1081 ÷ 7 | leaves 3 |
| 11 | 1081 ÷ 11 | leaves 3 |
| 13 | 1081 ÷ 13 | leaves 2 |
| 17 | 1081 ÷ 17 | leaves 10 |
| 19 | 1081 ÷ 19 | leaves 17 |
| 23 | 1081 ÷ 23 | divides exactly (47) |
| 29 | 1081 ÷ 29 | leaves 8 |
| 31 | 1081 ÷ 31 | leaves 27 |
Questions
Is 1081 a prime number?
No, 1081 is not a prime number. It is divisible by 23: 1081 = 23 × 47.
What is the next prime after 1081?
1087.
What is the prime number before 1081?
1069.
What are the factors of 1081?
1, 23, 47, 1081.