Is 99 Prime?
Check if 99 is a prime number. A prime number is only divisible by 1 and itself.
Result:
✗ NO — 99 is NOT a prime number
Step-by-Step Solution
Step 1
What is a Prime Number?
A prime number is a natural number greater than 1 that has exactly two factors: 1 and itself.
To check if 99 is prime, we need to verify that no number from 2 to √99 divides it evenly.
Step 2
Determine Testing Range
Since 99 is odd, we only need to check odd divisors.
We only need to test up to √99 ≈ 9.95, which rounds down to 9.
If 99 has a factor larger than √99, it must also have a corresponding factor smaller than √99.
Step 3
Test Odd Divisors
Testing: 3, 5, 7, ... up to 9
99 ÷ 3 = 33 (no remainder!)
We found that 3 divides 99 evenly!
Step 4
Conclusion
99 = 3 × 33
Since 99 has factors other than 1 and itself, 99 is NOT a prime number.