Is 242138509 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 242 138 509 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 242 138 509, the only two divisors are 1 and 242 138 509. Therefore 242 138 509 is a prime number.
As a consequence, 242 138 509 is only a multiple of 1 and 242 138 509.
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Since 242138509 is a prime number, 242138509 is also a deficient number, that is to say 242138509 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 242138509 without 242138509 itself (that is 1, by definition!).