Is 357 a prime number?
No, 357 is not a prime number. It is divisible by 3: 357 = 3 × 119.
Is 357 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 √357 ≈ 18.89. If none of them divides 357, it is prime.
- 3
3 divides 357 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 357 = 3 \times 7 \times 17 \]
Testing 357 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 357 ÷ 2 | leaves 1 |
| 3 | 357 ÷ 3 | divides exactly (119) |
| 5 | 357 ÷ 5 | leaves 2 |
| 7 | 357 ÷ 7 | divides exactly (51) |
| 11 | 357 ÷ 11 | leaves 5 |
| 13 | 357 ÷ 13 | leaves 6 |
| 17 | 357 ÷ 17 | divides exactly (21) |
Questions
Is 357 a prime number?
No, 357 is not a prime number. It is divisible by 3: 357 = 3 × 119.
What is the next prime after 357?
359.
What is the prime number before 357?
353.
What are the factors of 357?
1, 3, 7, 17, 21, 51, 119, 357.