13, 23, 43, 53, 73, 83
2, 3, 5, and 7 are the only one-digit prime numbers.
non-prime no.
24 of them.
71,73,79
No. Like all numbers ending in the digit 4, it is even.
0 Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.
84 is not a prime. All numbers ending in four are composite.
All the two digit prime numbers that can be reversed are 11, 13 and 31, 17 and 71, 37 and 73, and 79 and 97.
For a 2-digit prime number (which are all odd) to be the sum of two prime numbers, one of the prime numbers will have to be 2. That means the difference between the sum and the other addend will have to be 2. Prime numbers that differ by 2 are called twin primes. There are six pairs of 2-digit twin primes. Your numbers are 13, 19, 31, 43, 61 and 73.
No. All whole numbers ending in zero are composite.
No. All whole numbers ending in zero are composite.