Is 387 a prime number?
No, 387 is not a prime number. It is divisible by 3: 387 = 3 × 129.
Is 387 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 √387 ≈ 19.67. If none of them divides 387, it is prime.
- 3
3 divides 387 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 387 = 3^{2} \times 43 \]Testing 387 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 387 ÷ 2 | leaves 1 |
| 3 | 387 ÷ 3 | divides exactly (129) |
| 5 | 387 ÷ 5 | leaves 2 |
| 7 | 387 ÷ 7 | leaves 2 |
| 11 | 387 ÷ 11 | leaves 2 |
| 13 | 387 ÷ 13 | leaves 10 |
| 17 | 387 ÷ 17 | leaves 13 |
| 19 | 387 ÷ 19 | leaves 7 |
Questions
Is 387 a prime number?
No, 387 is not a prime number. It is divisible by 3: 387 = 3 × 129.
What is the next prime after 387?
389.
What is the prime number before 387?
383.
What are the factors of 387?
1, 3, 9, 43, 129, 387.