Here is what I have and I think I am really close.
$(2k + 1) * 2l$ = $4kl + 2l$
EDIT
My question is stupidly wrong, I probably meant to ask the product of odd number and even number not divisible by 4.
2026-04-01 02:05:45.1775009145
How do I show that the product of even and odd number is always congruent to 2 modulo 4?
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It is not true. $3\cdot 4=12 \equiv 0 \pmod 4$