Is 120201209 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 120 201 209 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 120 201 209, the only two divisors are 1 and 120 201 209. Therefore 120 201 209 is a prime number.
As a consequence, 120 201 209 is only a multiple of 1 and 120 201 209.
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Since 120201209 is a prime number, 120201209 is also a deficient number, that is to say 120201209 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 120201209 without 120201209 itself (that is 1, by definition!).
