Factors: 1, 5
Multiples: 5, 10, 15 and so on.
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The prime factors of 75 are 3, 5, 5 3 x 5 x 5 = 75
Not all (5 is prime) but every multiple of 5 greater than 5 is composite because they have more than two factors. Every multiple of any integer greater than one is composite.
The LCM of 5 and 14 is 70, which is the multiple of the combined prime factors of both numbers (2 x 5 x 7).7070
5*5*5*2. 5 and 2 are the only prime factors of 250, so you must multiple these together in order to find prime factorization.
45 is a composite since it factors are 5 and 9.