All of the numbers that end in 5 are multiples of 5 which means that they have more than two factors.
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5, all other numbers ending in 5 are divisible by 5.
No. If they end in 4, they are even numbers and divisible by 2, and therefore are not prime.
Two and five!
because all other numbers that end with 5 are divided by 5, in which case they are not prime!
The sum of the first three prime numbers that end with a 9 (19,29,59) is 107