- 149 is a prime number.
- Prime factorization: 149 is prime.
- The exponent of prime number 149 is 1. Adding 1 to that exponent we get (1 + 1) = 2. Therefore 149 has exactly 2 factors.
- Factors of 149: 1, 149
- Factor pairs: 149 = 1 x 149
- 149 has no square factors that allow its square root to be simplified. √149 ≈ 12.2065556

**How do we know that ****149**** is a prime number?** If 149 were not a prime number, then it would be divisible by at least one prime number less than or equal to √149 ≈ 12.2. Since 149 cannot be divided evenly by 2, 3, 5, 7, or 11, we know that 149 is a prime number.

Excel file of puzzles and previous week’s factor solutions: 12 Factors 2014-06-16

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