1 and 5
5 is prime.
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Prime factors of 1225 are 5, 5, 7, and 7.
The factors of 75 are 1, 3, 5, 15, 25 and 75. The prime factors are 3 and 5.
13 is a prime factor of itself Prime factors of 30 are: 2, 3 and 5
There are two prime factors of 45, they are 3 and 5. The prime factors of 54 are 2 and 3.
5 is a prime number. It is only evenly divisible by itself and one.5 is a prime number, so the only prime factor of 5 is itself.5 is already a prime number; it has no factorization.