Is 145 a prime number?
No, 145 is not a prime number. It is divisible by 5: 145 = 5 × 29.
Is 145 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 √145 ≈ 12.04. If none of them divides 145, it is prime.
- 3
5 divides 145 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 145 = 5 \times 29 \]
Testing 145 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 145 ÷ 2 | leaves 1 |
| 3 | 145 ÷ 3 | leaves 1 |
| 5 | 145 ÷ 5 | divides exactly (29) |
| 7 | 145 ÷ 7 | leaves 5 |
| 11 | 145 ÷ 11 | leaves 2 |
Questions
Is 145 a prime number?
No, 145 is not a prime number. It is divisible by 5: 145 = 5 × 29.
What is the next prime after 145?
149.
What is the prime number before 145?
139.
What are the factors of 145?
1, 5, 29, 145.