Is 842 a prime number?
No, 842 is not a prime number. It is divisible by 2: 842 = 2 × 421.
Is 842 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 √842 ≈ 29.02. If none of them divides 842, it is prime.
- 3
2 divides 842 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 842 = 2 \times 421 \]
Testing 842 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 842 ÷ 2 | divides exactly (421) |
| 3 | 842 ÷ 3 | leaves 2 |
| 5 | 842 ÷ 5 | leaves 2 |
| 7 | 842 ÷ 7 | leaves 2 |
| 11 | 842 ÷ 11 | leaves 6 |
| 13 | 842 ÷ 13 | leaves 10 |
| 17 | 842 ÷ 17 | leaves 9 |
| 19 | 842 ÷ 19 | leaves 6 |
| 23 | 842 ÷ 23 | leaves 14 |
| 29 | 842 ÷ 29 | leaves 1 |
Questions
Is 842 a prime number?
No, 842 is not a prime number. It is divisible by 2: 842 = 2 × 421.
What is the next prime after 842?
853.
What is the prime number before 842?
839.
What are the factors of 842?
1, 2, 421, 842.