Is 421299511 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 421 299 511 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 421 299 511, the only two divisors are 1 and 421 299 511. Therefore 421 299 511 is a prime number.
As a consequence, 421 299 511 is only a multiple of 1 and 421 299 511.
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Since 421299511 is a prime number, 421299511 is also a deficient number, that is to say 421299511 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 421299511 without 421299511 itself (that is 1, by definition!).