Is 143 a prime number?
No, 143 is not a prime number. It is divisible by 11: 143 = 11 × 13.
Is 143 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 √143 ≈ 11.96. If none of them divides 143, it is prime.
- 3
11 divides 143 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 143 = 11 \times 13 \]
Testing 143 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 143 ÷ 2 | leaves 1 |
| 3 | 143 ÷ 3 | leaves 2 |
| 5 | 143 ÷ 5 | leaves 3 |
| 7 | 143 ÷ 7 | leaves 3 |
| 11 | 143 ÷ 11 | divides exactly (13) |
Questions
Is 143 a prime number?
No, 143 is not a prime number. It is divisible by 11: 143 = 11 × 13.
What is the next prime after 143?
149.
What is the prime number before 143?
139.
What are the factors of 143?
1, 11, 13, 143.