A factor of 2 is a whole number that divides (or goes into) 2, without remainder. 2 is a prime, so there is no factor of 2 other than 1 and 2 itself.
A multiple of 2 is any number that 2 goes into, such as 2, 4, 6, 20002 etc.
The number that is both a factor and multiple of 2 is 2.
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factor pair = 10852, 1 factor pair = 5426, 2 factor pair = 2713, 4
factor pair = 36,1 factor pair = 18,2 factor pair = 12,3 factor pair = 9,4 factor pair = 6,6
One pair: it's a prime number.
They are:16 = 1 x 1616 = 2 x 816 = 4 x 4
A unique factor pair is a pair of factors that haven't been given already that multiply to give the original number. For instance, if I was going to work out the factors of 24, I would put 1, 2, 3, 4, 6, 8, 12 and 24.The unique factor pairs would be 1 and 24, 2 and 12, 3 and 8, 4 and 6. I could also write 8 and 3 as a factor pair, but as I've already put the reverse of this, it would not be a uniquefactor pair.