Is 998180809 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 998 180 809 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 998 180 809, the only two divisors are 1 and 998 180 809. Therefore 998 180 809 is a prime number.
As a consequence, 998 180 809 is only a multiple of 1 and 998 180 809.
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Since 998180809 is a prime number, 998180809 is also a deficient number, that is to say 998180809 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 998180809 without 998180809 itself (that is 1, by definition!).