The only prime factor of 16 is 2.
Small words make a difference. No prime number "has" a factor of 16. But 2 is the only prime number that "is" a factor of 16.
2 is the largest and only prime factor of 16.
The only prime factor of 16 is 2.
16 = 252 is the only prime factor of 16
The only prime factor of 16 is 2.
Factors of 16 are 1, 2, 4, 8, and 16. The only prime factor is 2. Note that 1 is neither prime nor composite number.
16 8,2 4,2,2 2,2,2,2
2 is the only prime factor of 16.
The only prime factor of 16 is two.
Use a factor tree. 9 3,3 16 8,2 4,2,2 2,2,2,2
16 has only one prime factor, and that is 2.