Is 247 a prime number?
No, 247 is not a prime number. It is divisible by 13: 247 = 13 × 19.
Is 247 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 √247 ≈ 15.72. If none of them divides 247, it is prime.
- 3
13 divides 247 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 247 = 13 \times 19 \]
Testing 247 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 247 ÷ 2 | leaves 1 |
| 3 | 247 ÷ 3 | leaves 1 |
| 5 | 247 ÷ 5 | leaves 2 |
| 7 | 247 ÷ 7 | leaves 2 |
| 11 | 247 ÷ 11 | leaves 5 |
| 13 | 247 ÷ 13 | divides exactly (19) |
Questions
Is 247 a prime number?
No, 247 is not a prime number. It is divisible by 13: 247 = 13 × 19.
What is the next prime after 247?
251.
What is the prime number before 247?
241.
What are the factors of 247?
1, 13, 19, 247.