It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 021 is not a prime number.
For example, 402 021 can be divided by 3: 402 021 / 3 = 134 007.
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For 402 021 to be a prime number, it would have been required that 402 021 has only two divisors, i.e., itself and 1.
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402 021 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 402 021 is about 634.051.
Thus, the square root of 402 021 is not an integer, and therefore 402 021 is not a square number.
The square of a number (here 402 021) is the result of the product of this number (402 021) by itself (i.e., 402 021 × 402 021); the square of 402 021 is sometimes called "raising 402 021 to the power 2", or "402 021 squared".
The square of 402 021 is 161 620 884 441 because 402 021 × 402 021 = 402 0212 = 161 620 884 441.
As a consequence, 402 021 is the square root of 161 620 884 441.
The multiples of 402 021 are all integers evenly divisible by 402 021, that is all numbers such that the remainder of the division by 402 021 is zero. There are infinitely many multiples of 402 021. The smallest multiples of 402 021 are: