pH is the logarithm of a concentration (multiplied by -1). So you can in principle have any pH, such as -2, +18 etc.
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No.
No it isn't.
Any number that is greater than 14 or less than -14 will have an absolute value greater than 14. Mathematically expressed as if |n| > 14 then n > 14 or n < -14.
14 is greater than -15
34 is greater than 14.