Is 720 a prime number?
No, 720 is not a prime number. It is divisible by 2: 720 = 2 × 360.
Is 720 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 √720 ≈ 26.83. If none of them divides 720, it is prime.
- 3
2 divides 720 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 720 = 2^{4} \times 3^{2} \times 5 \]Testing 720 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 720 ÷ 2 | divides exactly (360) |
| 3 | 720 ÷ 3 | divides exactly (240) |
| 5 | 720 ÷ 5 | divides exactly (144) |
| 7 | 720 ÷ 7 | leaves 6 |
| 11 | 720 ÷ 11 | leaves 5 |
| 13 | 720 ÷ 13 | leaves 5 |
| 17 | 720 ÷ 17 | leaves 6 |
| 19 | 720 ÷ 19 | leaves 17 |
| 23 | 720 ÷ 23 | leaves 7 |
Questions
Is 720 a prime number?
No, 720 is not a prime number. It is divisible by 2: 720 = 2 × 360.
What is the next prime after 720?
727.
What is the prime number before 720?
719.
What are the factors of 720?
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720.