Is 121 a prime number?
No, 121 is not a prime number. It is divisible by 11: 121 = 11 × 11.
Is 121 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 √121 ≈ 11.00. If none of them divides 121, it is prime.
- 3
11 divides 121 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 121 = 11^{2} \]Testing 121 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 121 ÷ 2 | leaves 1 |
| 3 | 121 ÷ 3 | leaves 1 |
| 5 | 121 ÷ 5 | leaves 1 |
| 7 | 121 ÷ 7 | leaves 2 |
| 11 | 121 ÷ 11 | divides exactly (11) |
Questions
Is 121 a prime number?
No, 121 is not a prime number. It is divisible by 11: 121 = 11 × 11.
What is the next prime after 121?
127.
What is the prime number before 121?
113.
What are the factors of 121?
1, 11, 121.