75 = 3 x 5 x 5 OR 3 x 52
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83 is prime. No tree.
The prime factors are: 3, 5. So, 3 x 5 = 15
The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.
When the bottom branch consists entirely of prime numbers.
The factors of 75 are 1, 3, 5, 15, 25 and 75. The prime factors are 3 and 5.