Is 245 a prime number?
No, 245 is not a prime number. It is divisible by 5: 245 = 5 × 49.
Is 245 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 √245 ≈ 15.65. If none of them divides 245, it is prime.
- 3
5 divides 245 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 245 = 5 \times 7^{2} \]Testing 245 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 245 ÷ 2 | leaves 1 |
| 3 | 245 ÷ 3 | leaves 2 |
| 5 | 245 ÷ 5 | divides exactly (49) |
| 7 | 245 ÷ 7 | divides exactly (35) |
| 11 | 245 ÷ 11 | leaves 3 |
| 13 | 245 ÷ 13 | leaves 11 |
Questions
Is 245 a prime number?
No, 245 is not a prime number. It is divisible by 5: 245 = 5 × 49.
What is the next prime after 245?
251.
What is the prime number before 245?
241.
What are the factors of 245?
1, 5, 7, 35, 49, 245.