It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 409 129 is not a prime number.
For example, 120 409 129 can be divided by 199: 120 409 129 / 199 = 605 071.
For 120 409 129 to be a prime number, it would have been required that 120 409 129 has only two divisors, i.e., itself and 1.
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120 409 129 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 120 409 129 is about 10 973.109.
Thus, the square root of 120 409 129 is not an integer, and therefore 120 409 129 is not a square number.
The square of a number (here 120 409 129) is the result of the product of this number (120 409 129) by itself (i.e., 120 409 129 × 120 409 129); the square of 120 409 129 is sometimes called "raising 120 409 129 to the power 2", or "120 409 129 squared".
The square of 120 409 129 is 14 498 358 346 538 640 because 120 409 129 × 120 409 129 = 120 409 1292 = 14 498 358 346 538 640.
As a consequence, 120 409 129 is the square root of 14 498 358 346 538 640.
120 409 129 is a number with 9 digits.
The multiples of 120 409 129 are all integers evenly divisible by 120 409 129, that is all numbers such that the remainder of the division by 120 409 129 is zero. There are infinitely many multiples of 120 409 129. The smallest multiples of 120 409 129 are: