Why MatLab gives me incorrect result for prime number?

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Felipe Alcalde
Felipe Alcalde le 11 Jan 2018
Modifié(e) : Felipe Alcalde le 11 Jan 2018
The function isprime() gives correct result for "small" numbers:
isprime(2^31-1) TRUE
BUT it gives incorrect result for larger numbers that are proved to be prime:
isprime(2^61-1) FALSE (but should be true)
WHY??
OK, I guess it is because I am trying to use a bigger number than Matlab can handle. But then, why Matlab does not show any error? and how can I check if a number this big is prime using MatLab?

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