No, 87 is not a prime number. It is a composite number: its digits add up to 15, which is divisible by 3, so 87 is divisible by 3.
87 has divisors other than 1 and itself. The smallest is 3: 87 ÷ 3 = 29.
Prime factorization: 87 = 3 × 29.
| Number | Prime? |
|---|---|
| 83 | Yes |
| 84 | No, 2 × 2 × 3 × 7 |
| 85 | No, 5 × 17 |
| 86 | No, 2 × 43 |
| 88 | No, 2 × 2 × 2 × 11 |
| 89 | Yes |
| 90 | No, 2 × 3 × 3 × 5 |
| 91 | No, 7 × 13 |
More about 87: factors of 87 · 87 squared · square root of 87 · 87 in binary · 87 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.