There are lots of possible answers, so I will give you 3 examples: 1 and 500, 2 and 250, 10 and 50.
Multiply the first two numbers first. Then multiply the result with the third number.
396
1x51=51
The numbers are: -5 and 3
The two numbers can be 5 times 8 = 40
1500
3000
Multiplicands.
The question does not make sense. There are not 500 prime numbers but infinitely many!
Multiply the first two numbers first. Then multiply the result with the third number.
2x7
An infinite number of times. If you restrict yourself to whole numbers, 500 has 6 factor pairs.
199
The two numbers that can multiply to make 38 are 1 and 38, as 1 multiplied by 38 equals 38. Another pair of numbers that can multiply to make 38 is 2 and 19, as 2 multiplied by 19 also equals 38. These are the only pairs of whole numbers that can multiply to give 38.
i have no idea what it is but i think its something you multiply by itself and you will get the answer.
6x7
396