Is 40398643 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 40 398 643 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 40 398 643, the only two divisors are 1 and 40 398 643. Therefore 40 398 643 is a prime number.
As a consequence, 40 398 643 is only a multiple of 1 and 40 398 643.
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Since 40398643 is a prime number, 40398643 is also a deficient number, that is to say 40398643 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 40398643 without 40398643 itself (that is 1, by definition!).