It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 122 409 is not a prime number.
For example, 122 409 can be divided by 3: 122 409 / 3 = 40 803.
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For 122 409 to be a prime number, it would have been required that 122 409 has only two divisors, i.e., itself and 1.
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122 409 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 122 409 is about 349.870.
Thus, the square root of 122 409 is not an integer, and therefore 122 409 is not a square number.
The square of a number (here 122 409) is the result of the product of this number (122 409) by itself (i.e., 122 409 × 122 409); the square of 122 409 is sometimes called "raising 122 409 to the power 2", or "122 409 squared".
The square of 122 409 is 14 983 963 281 because 122 409 × 122 409 = 122 4092 = 14 983 963 281.
As a consequence, 122 409 is the square root of 14 983 963 281.
The multiples of 122 409 are all integers evenly divisible by 122 409, that is all numbers such that the remainder of the division by 122 409 is zero. There are infinitely many multiples of 122 409. The smallest multiples of 122 409 are: