It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 018 is not a prime number.
For example, 402 018 can be divided by 2: 402 018 / 2 = 201 009.
For 402 018 to be a prime number, it would have been required that 402 018 has only two divisors, i.e., itself and 1.
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402 018 is an even number, because it is evenly divisible by 2: 402 018 / 2 = 201 009.
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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 402 018 is about 634.049.
Thus, the square root of 402 018 is not an integer, and therefore 402 018 is not a square number.
The square of a number (here 402 018) is the result of the product of this number (402 018) by itself (i.e., 402 018 × 402 018); the square of 402 018 is sometimes called "raising 402 018 to the power 2", or "402 018 squared".
The square of 402 018 is 161 618 472 324 because 402 018 × 402 018 = 402 0182 = 161 618 472 324.
As a consequence, 402 018 is the square root of 161 618 472 324.
The multiples of 402 018 are all integers evenly divisible by 402 018, that is all numbers such that the remainder of the division by 402 018 is zero. There are infinitely many multiples of 402 018. The smallest multiples of 402 018 are: