Is 165 a prime number?
No, 165 is not a prime number. It is divisible by 3: 165 = 3 × 55.
Is 165 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 √165 ≈ 12.85. If none of them divides 165, it is prime.
- 3
3 divides 165 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 165 = 3 \times 5 \times 11 \]
Testing 165 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 165 ÷ 2 | leaves 1 |
| 3 | 165 ÷ 3 | divides exactly (55) |
| 5 | 165 ÷ 5 | divides exactly (33) |
| 7 | 165 ÷ 7 | leaves 4 |
| 11 | 165 ÷ 11 | divides exactly (15) |
Questions
Is 165 a prime number?
No, 165 is not a prime number. It is divisible by 3: 165 = 3 × 55.
What is the next prime after 165?
167.
What is the prime number before 165?
163.
What are the factors of 165?
1, 3, 5, 11, 15, 33, 55, 165.