Is 142 a prime number?
No, 142 is not a prime number. It is divisible by 2: 142 = 2 × 71.
Is 142 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 √142 ≈ 11.92. If none of them divides 142, it is prime.
- 3
2 divides 142 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 142 = 2 \times 71 \]
Testing 142 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 142 ÷ 2 | divides exactly (71) |
| 3 | 142 ÷ 3 | leaves 1 |
| 5 | 142 ÷ 5 | leaves 2 |
| 7 | 142 ÷ 7 | leaves 2 |
| 11 | 142 ÷ 11 | leaves 10 |
Questions
Is 142 a prime number?
No, 142 is not a prime number. It is divisible by 2: 142 = 2 × 71.
What is the next prime after 142?
149.
What is the prime number before 142?
139.
What are the factors of 142?
1, 2, 71, 142.