No, you can apply any mathematical operation to a prime number.
Because 2 is a prime number and 2 added to any other prime number will give an odd result.
5.
2 can be added to 5: 2+5 = 7
No, the sum of a prime number and a composite number is not always even.
You don't always. 2 + 5 = 7, for example. But all prime numbers other than 2 are odd and two odd numbers always equal an even number when added together.
Not quite.When two prime numbers of 3 and higher are added together, the result is always even, because all such prime numbers are odd numbers, and when two odd numbers are added together, the result is always an even number.However 2 is a prime number, and 2 is also an even number. Adding 2 (an even number) to a different prime number (an odd number) will always yield an odd number.Only if you don't include "2".
Because 2 is a prime number and 2 added to any other prime number will give an odd result.
5.
2 can be added to 5: 2+5 = 7
No, the sum of a prime number and a composite number is not always even.
You don't always. 2 + 5 = 7, for example. But all prime numbers other than 2 are odd and two odd numbers always equal an even number when added together.
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
You don't always. 2 + 5 = 7, for example. But all prime numbers other than 2 are odd and two odd numbers always equal an even number when added together.
No, and you do not even if you reverse them.
It is always 1 and the prime number itself.
To me seems any amount of 3 added befor 1 makes that number always remain prime needs a heavy discution for above subject to be proved.
Yes, a prime number is always greater than 1.