Is 100 a prime number?
No, 100 is not a prime number. It is divisible by 2: 100 = 2 × 50.
Is 100 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 √100 ≈ 10.00. If none of them divides 100, it is prime.
- 3
2 divides 100 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 100 = 2^{2} \times 5^{2} \]Testing 100 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 100 ÷ 2 | divides exactly (50) |
| 3 | 100 ÷ 3 | leaves 1 |
| 5 | 100 ÷ 5 | divides exactly (20) |
| 7 | 100 ÷ 7 | leaves 2 |
Questions
Is 100 a prime number?
No, 100 is not a prime number. It is divisible by 2: 100 = 2 × 50.
What is the next prime after 100?
101.
What is the prime number before 100?
97.
What are the factors of 100?
1, 2, 4, 5, 10, 20, 25, 50, 100.