-1
-11
They are -1 and -3
-241
-7
-21
The numbers are: 1 and -8
-3
1 x 187, 11 x 17.
How about: 5*5 = 25 or 1*25 = 25
Considering only natural numbers, besides the obvious 1 x 671, the only combination of two numbers that multiplies into 671 is 11 x 61 (or 61 x 11, of course).
1 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.