Is 240402391 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 240 402 391 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 240 402 391, the only two divisors are 1 and 240 402 391. Therefore 240 402 391 is a prime number.
As a consequence, 240 402 391 is only a multiple of 1 and 240 402 391.
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Since 240402391 is a prime number, 240402391 is also a deficient number, that is to say 240402391 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 240402391 without 240402391 itself (that is 1, by definition!).