Is 427 a prime number?
No, 427 is not a prime number. It is divisible by 7: 427 = 7 × 61.
Is 427 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 √427 ≈ 20.66. If none of them divides 427, it is prime.
- 3
7 divides 427 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 427 = 7 \times 61 \]
Testing 427 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 427 ÷ 2 | leaves 1 |
| 3 | 427 ÷ 3 | leaves 1 |
| 5 | 427 ÷ 5 | leaves 2 |
| 7 | 427 ÷ 7 | divides exactly (61) |
| 11 | 427 ÷ 11 | leaves 9 |
| 13 | 427 ÷ 13 | leaves 11 |
| 17 | 427 ÷ 17 | leaves 2 |
| 19 | 427 ÷ 19 | leaves 9 |
Questions
Is 427 a prime number?
No, 427 is not a prime number. It is divisible by 7: 427 = 7 × 61.
What is the next prime after 427?
431.
What is the prime number before 427?
421.
What are the factors of 427?
1, 7, 61, 427.