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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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.
17 is a prime number. 8 and 12 are not prime numbers.
8, 11, and 20.
To determine if any number is prime, one method is to check if it can be divided by any of the prime numbers less than its square root. The square root of 100 is 10 and the square root of 1000 is approximately 31.6, so any 3 digit number (100 to 999) needs to be tested for divisibility only with the prime numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31. Another test is that any number ending in 0, 2, 4, 5, 6, 7, or 8 cannot be prime.