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Powers of 2: 2, 4, 8, 16, 32, 64 and so on.

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2, and any power of 2: 4, 8, 16, 32, etc.

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Q: What numbers have 2 as their only prime factor?

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The only prime factor of 128 is 2.

The only prime factor these numbers share is 2. It is the only prime factor of 64, which is 2 to the 6th power. The hcf is 16, but that is not a prime.

The only prime factor of 64 is 2.

64 has only one prime factor and it is 2

There is only one even prime number: 2. All other even numbers have 2 as a factor, in addition to 1 and themselves, so they cannot be prime numbers.

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The only prime factor of 128 is 2.

The only prime factor of 64 is 2.

The only prime factor of 64 is 2.

The only prime factor of 16 is 2.

16 has only one prime factor, and that is 2.

The only prime factor these numbers share is 2. It is the only prime factor of 64, which is 2 to the 6th power. The hcf is 16, but that is not a prime.

The only prime factor of 64 is 2.

64 has only one prime factor and it is 2

2 is the only prime factor of 4.

The only even number that is prime is 2. No other even numbers can be prime because 2 is a factor of them. Prime numbers can have only two factors: 1 and itself.

64 has only one prime factor which is 2.

The only prime number (factor) of 128 is 2.