101. If you want a Prime number less than 100, the closest is 97.
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97 is the largest prime number under 100
97 is the largest prime number below 100.
9797 is the largest prime number less than 100.
97 is the largest prime number between 1 and 100.
As of August 2017, the largest known prime number is 2^74,207,281 − 1, a number with 22,338,618digits.I attached a link with the 100 largest known prime numbers, there you can see the number of digits.