It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 399 is not a prime number.
For example, 120 399 can be divided by 3: 120 399 / 3 = 40 133.
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For 120 399 to be a prime number, it would have been required that 120 399 has only two divisors, i.e., itself and 1.
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120 399 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 120 399 is about 346.986.
Thus, the square root of 120 399 is not an integer, and therefore 120 399 is not a square number.
The square of a number (here 120 399) is the result of the product of this number (120 399) by itself (i.e., 120 399 × 120 399); the square of 120 399 is sometimes called "raising 120 399 to the power 2", or "120 399 squared".
The square of 120 399 is 14 495 919 201 because 120 399 × 120 399 = 120 3992 = 14 495 919 201.
As a consequence, 120 399 is the square root of 14 495 919 201.
The multiples of 120 399 are all integers evenly divisible by 120 399, that is all numbers such that the remainder of the division by 120 399 is zero. There are infinitely many multiples of 120 399. The smallest multiples of 120 399 are: