It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 321 is not a prime number.
For example, 120 321 can be divided by 3: 120 321 / 3 = 40 107.
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For 120 321 to be a prime number, it would have been required that 120 321 has only two divisors, i.e., itself and 1.
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120 321 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 120 321 is about 346.873.
Thus, the square root of 120 321 is not an integer, and therefore 120 321 is not a square number.
The square of a number (here 120 321) is the result of the product of this number (120 321) by itself (i.e., 120 321 × 120 321); the square of 120 321 is sometimes called "raising 120 321 to the power 2", or "120 321 squared".
The square of 120 321 is 14 477 143 041 because 120 321 × 120 321 = 120 3212 = 14 477 143 041.
As a consequence, 120 321 is the square root of 14 477 143 041.
The multiples of 120 321 are all integers evenly divisible by 120 321, that is all numbers such that the remainder of the division by 120 321 is zero. There are infinitely many multiples of 120 321. The smallest multiples of 120 321 are: