Is 177209189 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 177 209 189 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 177 209 189, the only two divisors are 1 and 177 209 189. Therefore 177 209 189 is a prime number.
As a consequence, 177 209 189 is only a multiple of 1 and 177 209 189.
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Since 177209189 is a prime number, 177209189 is also a deficient number, that is to say 177209189 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 177209189 without 177209189 itself (that is 1, by definition!).