Is 170 a prime number?
No, 170 is not a prime number. It is divisible by 2: 170 = 2 × 85.
Is 170 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 √170 ≈ 13.04. If none of them divides 170, it is prime.
- 3
2 divides 170 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 170 = 2 \times 5 \times 17 \]
Testing 170 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 170 ÷ 2 | divides exactly (85) |
| 3 | 170 ÷ 3 | leaves 2 |
| 5 | 170 ÷ 5 | divides exactly (34) |
| 7 | 170 ÷ 7 | leaves 2 |
| 11 | 170 ÷ 11 | leaves 5 |
| 13 | 170 ÷ 13 | leaves 1 |
Questions
Is 170 a prime number?
No, 170 is not a prime number. It is divisible by 2: 170 = 2 × 85.
What is the next prime after 170?
173.
What is the prime number before 170?
167.
What are the factors of 170?
1, 2, 5, 10, 17, 34, 85, 170.