All multiples of 15 (15, 30, 45, 60, etc.) have 5 and 3 as factors.
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3, 5 and 7 have 2 factors. 81, 625 and 2401 have 5 factors.
The prime factors of 60 are 2, 2, 3, and 5.The prime factors of 105 are 3, 5, and 7.The prime numbers that are factors of both 60 and 105 are 3 and 5.
3, 5 and 7 are prime numbers. Their only factors are one and themselves.
The prime numbers (factors) of 75 are: 3 and 5
The prime factors are: 2 3 5