Is 1220 a prime number?
No, 1220 is not a prime number. It is divisible by 2: 1220 = 2 × 610.
Is 1220 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 √1220 ≈ 34.93. If none of them divides 1220, it is prime.
- 3
2 divides 1220 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 1220 = 2^{2} \times 5 \times 61 \]Testing 1220 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 1220 ÷ 2 | divides exactly (610) |
| 3 | 1220 ÷ 3 | leaves 2 |
| 5 | 1220 ÷ 5 | divides exactly (244) |
| 7 | 1220 ÷ 7 | leaves 2 |
| 11 | 1220 ÷ 11 | leaves 10 |
| 13 | 1220 ÷ 13 | leaves 11 |
| 17 | 1220 ÷ 17 | leaves 13 |
| 19 | 1220 ÷ 19 | leaves 4 |
| 23 | 1220 ÷ 23 | leaves 1 |
| 29 | 1220 ÷ 29 | leaves 2 |
| 31 | 1220 ÷ 31 | leaves 11 |
Questions
Is 1220 a prime number?
No, 1220 is not a prime number. It is divisible by 2: 1220 = 2 × 610.
What is the next prime after 1220?
1223.
What is the prime number before 1220?
1217.
What are the factors of 1220?
1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220.