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The only Prime number that ends in 5 is 5. All other numbers that end in 5 are multiples of 5 and would have more than two factors.
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What number's cant a prime number end in why?
Other than 2, no prime numbers are even. So prime numbers can't end in even numbers. After 5, no prime number can end in 5. After 5, all prime numbers end in 1, 3, 7 or 9.
What prime numbers end in a 2 or 5?
5 and 2 are the only prime numbers that end in a 5 or 2. A prime number is by definition only divisible by 1 and itself, and all other whole numbers ending in 5 or 2 are divisible by 5 or 2, respectively. Numbers that are not whole numbers cannot be prime.
Why are 5 and 2 the only prime numbers that end in a 5 or a 2?
All numbers larger than 5 which end in 5 are divisible by 5 and so are not prime. All numbers larger than 2 which end in 2 are divisible by 2 and so are not prime.
What do all prime numbers end with?
After 5, all prime numbers end with 1, 3, 7 or 9.
What prime numbers end a 2 OR 5?
Just 2 and 5
