There are 21 two-digit prime numbers.
There are 17 such numbers.
there are 4
There are 5 of them.
There are 12 such numbers.
17, 37, 47, 67, 97
An on-line prime number chart ended at 10007. There are many more charts available for download. So the answer is that there are many five digit prime numbers.
there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100
Ten.
4: 2, 3, 5 and 7. 1 is not a prime.
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
3 numbers 2, 23 and 29
13, 23, 43, 53, 73 & 83
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
a lot
90000
2