It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 021 is not a prime number.
For example, 120 021 can be divided by 3: 120 021 / 3 = 40 007.
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For 120 021 to be a prime number, it would have been required that 120 021 has only two divisors, i.e., itself and 1.
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120 021 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 120 021 is about 346.440.
Thus, the square root of 120 021 is not an integer, and therefore 120 021 is not a square number.
The square of a number (here 120 021) is the result of the product of this number (120 021) by itself (i.e., 120 021 × 120 021); the square of 120 021 is sometimes called "raising 120 021 to the power 2", or "120 021 squared".
The square of 120 021 is 14 405 040 441 because 120 021 × 120 021 = 120 0212 = 14 405 040 441.
As a consequence, 120 021 is the square root of 14 405 040 441.
The multiples of 120 021 are all integers evenly divisible by 120 021, that is all numbers such that the remainder of the division by 120 021 is zero. There are infinitely many multiples of 120 021. The smallest multiples of 120 021 are: