it is not a prime as it can be factored:
F5 = 225 + 1 = 232 + 1 = 4294967297 = 641 x 6700417
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yes 5 is a prime number,because it is divided by itself
5 is a prime number.
It is prime because its multiples are 1 and itself that is a prime number
5 itself is a prime number, so if you count 5 as ending in 5 that is one prime number. Other than that any number ending in 5 would be some multiple of 5 and therefore could not be a prime number.
Seven (7) is the next prime number after 5.