Is 355 a prime number?
No, 355 is not a prime number. It is divisible by 5: 355 = 5 × 71.
Is 355 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 √355 ≈ 18.84. If none of them divides 355, it is prime.
- 3
5 divides 355 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 355 = 5 \times 71 \]
Testing 355 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 355 ÷ 2 | leaves 1 |
| 3 | 355 ÷ 3 | leaves 1 |
| 5 | 355 ÷ 5 | divides exactly (71) |
| 7 | 355 ÷ 7 | leaves 5 |
| 11 | 355 ÷ 11 | leaves 3 |
| 13 | 355 ÷ 13 | leaves 4 |
| 17 | 355 ÷ 17 | leaves 15 |
Questions
Is 355 a prime number?
No, 355 is not a prime number. It is divisible by 5: 355 = 5 × 71.
What is the next prime after 355?
359.
What is the prime number before 355?
353.
What are the factors of 355?
1, 5, 71, 355.