81 is the largest square of a whole number...
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97 is the largest prime number less than one hundred.
Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.
4,6,8
2 hundred and 98
The largest "named numbers" are mathematical concepts (e.g. Graham's Number), followed by the googleplex 10googol and googol 10100.The largest number that continues the -illionnomenclature is the centillion (10303 "short scale").A number that is among the largest regularly used is the decillion (1033 "short scale")The number 1 less than a decillion(1,000,000,000,000,000,000,000,000,000,000,000,000)is 999,999,999,999,999,999,999,999,999,999,999or in words:Nine hundred and ninety-nine nonillion,Nine hundred and ninety-nine octillion,Nine hundred and ninety-nine septillion,Nine hundred and ninety-nine hexillion,Nine hundred and ninety-nine septillion,Nine hundred and ninety-nine quadrillion,Nine hundred and ninety-nine trillion,Nine hundred and ninety-nine billion,Nine hundred and ninety-nine million,Nine hundred and ninety-nine thousand,Nine hundred and ninety-nine.(see the related link)