It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 409 is not a prime number.
For example, 120 409 can be divided by 347: 120 409 / 347 = 347.
For 120 409 to be a prime number, it would have been required that 120 409 has only two divisors, i.e., itself and 1.
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120 409 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 120 409 is 347.
Therefore, the square root of 120 409 is an integer, and as a consequence 120 409 is a perfect square.
The square of a number (here 120 409) is the result of the product of this number (120 409) by itself (i.e., 120 409 × 120 409); the square of 120 409 is sometimes called "raising 120 409 to the power 2", or "120 409 squared".
The square of 120 409 is 14 498 327 281 because 120 409 × 120 409 = 120 4092 = 14 498 327 281.
As a consequence, 120 409 is the square root of 14 498 327 281.
The multiples of 120 409 are all integers evenly divisible by 120 409, that is all numbers such that the remainder of the division by 120 409 is zero. There are infinitely many multiples of 120 409. The smallest multiples of 120 409 are: