It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 408 is not a prime number.
For example, 402 408 can be divided by 2: 402 408 / 2 = 201 204.
For 402 408 to be a prime number, it would have been required that 402 408 has only two divisors, i.e., itself and 1.
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402 408 is an even number, because it is evenly divisible by 2: 402 408 / 2 = 201 204.
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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 402 408 is about 634.356.
Thus, the square root of 402 408 is not an integer, and therefore 402 408 is not a square number.
The square of a number (here 402 408) is the result of the product of this number (402 408) by itself (i.e., 402 408 × 402 408); the square of 402 408 is sometimes called "raising 402 408 to the power 2", or "402 408 squared".
The square of 402 408 is 161 932 198 464 because 402 408 × 402 408 = 402 4082 = 161 932 198 464.
As a consequence, 402 408 is the square root of 161 932 198 464.
The multiples of 402 408 are all integers evenly divisible by 402 408, that is all numbers such that the remainder of the division by 402 408 is zero. There are infinitely many multiples of 402 408. The smallest multiples of 402 408 are: