If you change the prime number 13 to base 7 you get 16. How can 16 be a prime number? Is it that 16 base 7 is a prime number in base 7 math? Can you give an example of how this could be true?
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The “base” just determines the specific kinds of written symbols you use to represent a number. It does not change any of the fundamental properties of that number.
Even/Odd numbers are still even/odd.
Negative/Positive numbers are still negative/positive.
Prime/composite numbers are still prime/composite.
Rational/Irrational numbers are still rational/irrational.
And so on.
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