Either pair or pairs is correct, but the usage will determine which. Pants, shoes, gloves and some other things come in pairs, and in general usage, a pair is two (as you probably already knew). Further, we can talk about one pair, or a number of pairs of things. Here are some examples of the singular usage:
She was caught in the downpour, and the water ruined her new pair of shoes.
He bought a pair of pants and two sport shirts.
The boy and girl each packed a pair of warm gloves for the trip.
Here are some examples of the plural usage:
Several pairs of gloves were lying on the table by the door.
The clerk rang up the three pairs of pants and the belt for the young man.
There were many pairs of shoes on the discount rack.
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The factor pairs of 4,568 are:factor pair = 4568,1factor pair = 2284,2factor pair = 1142,4factor pair = 571,8
The factor pairs of 612 are:factor pair = 612,1factor pair = 306,2factor pair = 204,3factor pair = 153,4factor pair = 102,6factor pair = 68,9factor pair = 51,12factor pair = 36,17factor pair = 34,18
You would need two pairs. One pair for you and one pair for your friend.
factor pair = 50,1factor pair = 25,2factor pair = 10,5
factor pair = 36,1factor pair = 18,2factor pair = 12,3factor pair = 9,4factor pair = 6,6