Usually, but not necessarily and not if they're prime. All prime numbers have the same number of factors.
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There is no need to do prime factorization as prime numbers are already prime.
The same way as with smaller numbers, it may take longer. Just keep dividing by prime numbers until all the factors are prime.
Prime factorization never includes a composite number. All numbers in prime factorization must be prime numbers.
There is no need to do prime factorization as prime numbers are already prime. You do not need to find the prime numbers that when multiplied together create the number.
When all the factors are prime numbers, that's a prime factorization.