It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 11 609 is not a prime number.
For example, 11 609 can be divided by 13: 11 609 / 13 = 893.
For 11 609 to be a prime number, it would have been required that 11 609 has only two divisors, i.e., itself and 1.
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11 609 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 11 609 is about 107.745.
Thus, the square root of 11 609 is not an integer, and therefore 11 609 is not a square number.
The square of a number (here 11 609) is the result of the product of this number (11 609) by itself (i.e., 11 609 × 11 609); the square of 11 609 is sometimes called "raising 11 609 to the power 2", or "11 609 squared".
The square of 11 609 is 134 768 881 because 11 609 × 11 609 = 11 6092 = 134 768 881.
As a consequence, 11 609 is the square root of 134 768 881.
The multiples of 11 609 are all integers evenly divisible by 11 609, that is all numbers such that the remainder of the division by 11 609 is zero. There are infinitely many multiples of 11 609. The smallest multiples of 11 609 are: