Yes.
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Yes, just as 1 is considered a factor of everything, a number is considered a factor of itself.
1 is not considered to be a prime or composite number because it has only one factor which is itself.
If the number 1 is considered a factor, then these are the prime numbers. Their only factors are 1 and themselves.
No. Apart from -1 and 1, no other whole number is a factor of 1.
It is. 1 is a factor of every whole number.