-146
312
511
-1097
No. In order for two factors (i.e. two numbers multiplied together) to result in an even number, at least one of the factors must be even. Except for "2" all prime numbers by definition must be odd numbers. 168/2 = 84. 84 is not prime. Therefore you are looking for 2 odd factors of 168. But this is a fruitless search as 2 odd numbers multiplied together will never result in an even number.
-1 and 6
312
A number multiplied by itself added to itself equals 30. What are the two possible numbers?
2 x 7 x 12
511
-166
5+5 By quadratic equation the two numbers (roots) are: 8.872983346 and 1.127016653 Added together = 10 Multiplied = 10
21 and 7
15
79
-1097
The numbers are 1 and 10.
In ordinary maths, yes.