Un = 4(n-1) where n = 1, 2, 3, ...
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2, 4, 8 and 16 go into 16 and 64.
These are the square numbers: 1, 4, 9, 16, 25, 36, 49, 64, 81...
No, a prime number is divisable only by itself and 1. The number 64 can be divided by 64, 32, 16, 8, 4, 2 and 1 so it is not a prime number.
The divisors of 64 are: 1 2 4 8 16 32 64.
The next number in the sequence is... 64