There are infinitely many number pairs:
Select any number, X, greater than sqrt(630) = 25.1
Let Y = 630/X
Then X*Y = X*(630/X) = 630
Since there are infinitely many numbers greater than 25.1 and X can be any one of them, there are infinitely many possible answers.
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9
38 and 8
21 and 5
The numbers are: -5 and 3
The two numbers can be 5 times 8 = 40