It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 988 is not a prime number.
For example, 402 988 can be divided by 2: 402 988 / 2 = 201 494.
For 402 988 to be a prime number, it would have been required that 402 988 has only two divisors, i.e., itself and 1.
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402 988 is an even number, because it is evenly divisible by 2: 402 988 / 2 = 201 494.
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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 402 988 is about 634.813.
Thus, the square root of 402 988 is not an integer, and therefore 402 988 is not a square number.
The square of a number (here 402 988) is the result of the product of this number (402 988) by itself (i.e., 402 988 × 402 988); the square of 402 988 is sometimes called "raising 402 988 to the power 2", or "402 988 squared".
The square of 402 988 is 162 399 328 144 because 402 988 × 402 988 = 402 9882 = 162 399 328 144.
As a consequence, 402 988 is the square root of 162 399 328 144.
The multiples of 402 988 are all integers evenly divisible by 402 988, that is all numbers such that the remainder of the division by 402 988 is zero. There are infinitely many multiples of 402 988. The smallest multiples of 402 988 are: