Divide by two.
16
8,2
4,2,2
2,2,2,2
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
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.
The only prime factor of 16 is 2.
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.