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A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. yes, there are 8 digit prime numbers.

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Q: Are there any 8 digit prime numbers?

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The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.

17

Using prime factorization, there are 2 three digit numbers with 9 factors: 512 and 768. There are no three digit numbers with 10 or more prime factors. 512=2^9 and 768=3*2^8

8

The smallest three-digit number divisible by the first three prime numbers (2, 3, and 5) and the first three composite numbers (4, 6, and 8) is 120.

That's close to five million numbers. I'm not printing out five million numbers. There are plenty of online resources where that information can be found.

There is only one even prime number (2). There are no 8-digit even primes.

3

There are eight prime numbers under 20.

17 is a prime number. 8 and 12 are not prime numbers.

90(:

99999999

10,000,019

6, if you don't repeat any numbers.

17, 53 and 71 all qualify.

There are not 99999999 eight digit numbers - unless you allow numbers with leading 0s.

There are 8*8 = 64 such numbers.

The first digit can be any one of 8. For each of these . . .The second digit can be any one of 10. For each of these . . .The third digit can be any one of 10. For each of these . . .The fourth digit can be any one of 8.Total possibilities = (8 x 10 x 10 x 8) = 6,400

The largest eight-digit prime number is 99,999,991. The smallest nine-digit number, for comparison, is 100,000,019.

The first 8 digit number is 10,000,000, the last is 99,999,999 which means there are 90,000,000 8 digit numbers

-5

The sum of the first 8 prime numbers is 77.

A prime number is evenly divisible only by itself and one. Any three digit number ending in 0, 2, 4, 6, or 8 is evenly divisible by 2 - so not a prime Any three digit number ending in 5 is divisible by 5, so not a prime number. The only even prime number is 2. The only prime number that ends in 5 is 5.

8, 11, and 20.

It is 10000019.