An even number is any number that has '2' as a factor.
When you multiply two numbers, you multiply all the factors of both of them.
If '2' was a factor of either number, or of both, then it's a factor of their product,
and the product must therefore be an even number.
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no eg: 9x4=36
No such numbers exist; the product of two odd numbers is always odd.
No. The sum as well as product of two even numbers can only be an even number.
No. If you have an odd number (for example 5) and an even number (say 2) and you multiply them together, you will get an even number (10). Therefore, just because the product of two numbers are even does not make both the numbers being multiplied together even (although at least one must be).
No whole number would fit (their product would be even for starters).