Yes, it is.
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No. Apart from -1 and 1, no other whole number is a factor of 1.
No, for 0 to be a factor, the numbers would have to be divisible by 0. You can't divide any number by 0, so it can't be a factor.1 is a factor of every positive number.
It is called a factor.
Every whole number (obviously not 0) is a multiple of 1.
0 is a whole, integer, and rational number. O is whole number because a whole number is every positive number