It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 998 is not a prime number.
For example, 402 998 can be divided by 2: 402 998 / 2 = 201 499.
For 402 998 to be a prime number, it would have been required that 402 998 has only two divisors, i.e., itself and 1.
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402 998 is an even number, because it is evenly divisible by 2: 402 998 / 2 = 201 499.
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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 402 998 is about 634.821.
Thus, the square root of 402 998 is not an integer, and therefore 402 998 is not a square number.
The square of a number (here 402 998) is the result of the product of this number (402 998) by itself (i.e., 402 998 × 402 998); the square of 402 998 is sometimes called "raising 402 998 to the power 2", or "402 998 squared".
The square of 402 998 is 162 407 388 004 because 402 998 × 402 998 = 402 9982 = 162 407 388 004.
As a consequence, 402 998 is the square root of 162 407 388 004.
The multiples of 402 998 are all integers evenly divisible by 402 998, that is all numbers such that the remainder of the division by 402 998 is zero. There are infinitely many multiples of 402 998. The smallest multiples of 402 998 are: