Is 139378241 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 139 378 241 is a prime number.
Indeed, the definition of a prime numbers is to have exactly two distinct positive divisors, 1 and itself. A number is a divisor of another number when the remainder of Euclid’s division of the second one by the first one is zero. Concerning the number 139 378 241, the only two divisors are 1 and 139 378 241. Therefore 139 378 241 is a prime number.
As a consequence, 139 378 241 is only a multiple of 1 and 139 378 241.
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Since 139378241 is a prime number, 139378241 is also a deficient number, that is to say 139378241 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 139378241 without 139378241 itself (that is 1, by definition!).