Is 87 a prime number?
No, 87 is not a prime number. It is divisible by 3: 87 = 3 × 29.
Is 87 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 √87 ≈ 9.33. If none of them divides 87, it is prime.
- 3
3 divides 87 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 87 = 3 \times 29 \]
Testing 87 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 87 ÷ 2 | leaves 1 |
| 3 | 87 ÷ 3 | divides exactly (29) |
| 5 | 87 ÷ 5 | leaves 2 |
| 7 | 87 ÷ 7 | leaves 3 |
Questions
Is 87 a prime number?
No, 87 is not a prime number. It is divisible by 3: 87 = 3 × 29.
What is the next prime after 87?
89.
What is the prime number before 87?
83.
What are the factors of 87?
1, 3, 29, 87.