Is 133 a prime number?
No, 133 is not a prime number. It is divisible by 7: 133 = 7 × 19.
Is 133 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 √133 ≈ 11.53. If none of them divides 133, it is prime.
- 3
7 divides 133 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 133 = 7 \times 19 \]
Testing 133 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 133 ÷ 2 | leaves 1 |
| 3 | 133 ÷ 3 | leaves 1 |
| 5 | 133 ÷ 5 | leaves 3 |
| 7 | 133 ÷ 7 | divides exactly (19) |
| 11 | 133 ÷ 11 | leaves 1 |
Questions
Is 133 a prime number?
No, 133 is not a prime number. It is divisible by 7: 133 = 7 × 19.
What is the next prime after 133?
137.
What is the prime number before 133?
131.
What are the factors of 133?
1, 7, 19, 133.