Is 1242 a prime number?
No, 1242 is not a prime number. It is divisible by 2: 1242 = 2 × 621.
Is 1242 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 √1242 ≈ 35.24. If none of them divides 1242, it is prime.
- 3
2 divides 1242 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 1242 = 2 \times 3^{3} \times 23 \]Testing 1242 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 1242 ÷ 2 | divides exactly (621) |
| 3 | 1242 ÷ 3 | divides exactly (414) |
| 5 | 1242 ÷ 5 | leaves 2 |
| 7 | 1242 ÷ 7 | leaves 3 |
| 11 | 1242 ÷ 11 | leaves 10 |
| 13 | 1242 ÷ 13 | leaves 7 |
| 17 | 1242 ÷ 17 | leaves 1 |
| 19 | 1242 ÷ 19 | leaves 7 |
| 23 | 1242 ÷ 23 | divides exactly (54) |
| 29 | 1242 ÷ 29 | leaves 24 |
| 31 | 1242 ÷ 31 | leaves 2 |
Questions
Is 1242 a prime number?
No, 1242 is not a prime number. It is divisible by 2: 1242 = 2 × 621.
What is the next prime after 1242?
1249.
What is the prime number before 1242?
1237.
What are the factors of 1242?
1, 2, 3, 6, 9, 18, 23, 27, 46, 54, 69, 138, 207, 414, 621, 1242.