Is 209 a prime number?
No, 209 is not a prime number. It is divisible by 11: 209 = 11 × 19.
Is 209 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 √209 ≈ 14.46. If none of them divides 209, it is prime.
- 3
11 divides 209 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 209 = 11 \times 19 \]
Testing 209 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 209 ÷ 2 | leaves 1 |
| 3 | 209 ÷ 3 | leaves 2 |
| 5 | 209 ÷ 5 | leaves 4 |
| 7 | 209 ÷ 7 | leaves 6 |
| 11 | 209 ÷ 11 | divides exactly (19) |
| 13 | 209 ÷ 13 | leaves 1 |
Questions
Is 209 a prime number?
No, 209 is not a prime number. It is divisible by 11: 209 = 11 × 19.
What is the next prime after 209?
211.
What is the prime number before 209?
199.
What are the factors of 209?
1, 11, 19, 209.