Is 74721209 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 74 721 209 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 74 721 209, the only two divisors are 1 and 74 721 209. Therefore 74 721 209 is a prime number.
As a consequence, 74 721 209 is only a multiple of 1 and 74 721 209.
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Since 74721209 is a prime number, 74721209 is also a deficient number, that is to say 74721209 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 74721209 without 74721209 itself (that is 1, by definition!).