Is 198438991 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 198 438 991 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 198 438 991, the only two divisors are 1 and 198 438 991. Therefore 198 438 991 is a prime number.
As a consequence, 198 438 991 is only a multiple of 1 and 198 438 991.
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Since 198438991 is a prime number, 198438991 is also a deficient number, that is to say 198438991 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 198438991 without 198438991 itself (that is 1, by definition!).