There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.
Infinate
10
Ten of them.
17,425,170 digits
15: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47
There are 57 such numbers.
solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.
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4,053,946
From 1 to infinity. In other words, it can have any amount of digits.
infintate as numbers do not stop, so you can keep adding digits at the end of the negative number.