3 numbers 2, 23 and 29
There are 21 two-digit prime numbers.
There are 17 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
24 of them.
Ten.
From {1, 2, 3, 4} there are two prime numbers (2, 3} which can go in the hundreds position, which once chosen allows 3 possible choices for the tens digit and a further 2 possible choices for the units digit, giving 2 x 3 x 2 = 12 possible numbers.
25 of them
46 of them.
25 of them.
25 of them.