No, neither is a prime.
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No. Not even close. Examples: 4+4=8 8+8=16 16+16=32 . . .4, 8, and 16 are not prime numbers.
It is: 2^4 = 16
No. It can be divided by 1, 2, 4, 8 and 16. To be prime a number it can only be divisible by 1 and itself.
1, 2, 4, 8, 16, x, y 2 is prime.
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.