Because it s a Prime number (it can only be divided by the number one and itself) and it has an absolute value larger than the number 5 (which is also a prime number).
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Any prime number greater than 10 is an odd number but cannot end in 5 as this makes it divisible by 5. Therefore the ones digit of any prime number greater than 10 must be 1, 3, 7 or 9.
The only other single-digit number higher than 5 which is a prime number is 7 - 9 is equal to 3 squared, and is thus not a prime number.
It's greater than 5 and ends in 5.