Is 9821 a prime number?
No, 9821 is not a prime number. It is divisible by 7: 9821 = 7 × 1403.
Is 9821 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 √9821 ≈ 99.10. If none of them divides 9821, it is prime.
- 3
7 divides 9821 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 9821 = 7 \times 23 \times 61 \]
Testing 9821 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 9821 ÷ 2 | leaves 1 |
| 3 | 9821 ÷ 3 | leaves 2 |
| 5 | 9821 ÷ 5 | leaves 1 |
| 7 | 9821 ÷ 7 | divides exactly (1403) |
| 11 | 9821 ÷ 11 | leaves 9 |
| 13 | 9821 ÷ 13 | leaves 6 |
| 17 | 9821 ÷ 17 | leaves 12 |
| 19 | 9821 ÷ 19 | leaves 17 |
| 23 | 9821 ÷ 23 | divides exactly (427) |
| 29 | 9821 ÷ 29 | leaves 19 |
| 31 | 9821 ÷ 31 | leaves 25 |
| 37 | 9821 ÷ 37 | leaves 16 |
Questions
Is 9821 a prime number?
No, 9821 is not a prime number. It is divisible by 7: 9821 = 7 × 1403.
What is the next prime after 9821?
9829.
What is the prime number before 9821?
9817.
What are the factors of 9821?
1, 7, 23, 61, 161, 427, 1403, 9821.