first do 20 times 20 then double the answer
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This link gives you an excellent multiplication table and some tips.Please see related link below.
Any number that isn't on the list of products in an infinitely large multiplication table (excluding the 1s lines) is a prime.
All numbers in the 2s column on the multiplication table end in the even numbers 2, 4, 6, 8, or 0.
×12345678910111213141516171819201123456789101112131415161718192022468101214161820222426283032343638403369121518212427303336394245485154576044812162024283236404448525660646872768055101520253035404550556065707580859095100661218243036424854606672788490961021081141207714212835424956637077849198105112119126133140881624324048566472808896104112120128136144152160991827364554637281909910811712613514415316217118010102030405060708090100110120130140150160170180190200111122334455667788991101211321431541651761871982092201212243648607284961081201321441561681801922042162282401313263952657891104117130143156169182195208221234247260141428425670849811212614015416818219621022423825226628015153045607590105120135150165180195210225240255270285300161632486480961121281441601761922082242402562722883043201717345168851021191361531701872042212382552722893063233401818365472901081261441621801982162342522702883063243423601919385776951141331521711902092282472662853043233423613802020406080100120140160180200220240260280300320340360380400
Yes