It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 408 402 is not a prime number.
For example, 408 402 can be divided by 2: 408 402 / 2 = 204 201.
For 408 402 to be a prime number, it would have been required that 408 402 has only two divisors, i.e., itself and 1.
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408 402 is an even number, because it is evenly divisible by 2: 408 402 / 2 = 204 201.
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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 408 402 is about 639.063.
Thus, the square root of 408 402 is not an integer, and therefore 408 402 is not a square number.
The square of a number (here 408 402) is the result of the product of this number (408 402) by itself (i.e., 408 402 × 408 402); the square of 408 402 is sometimes called "raising 408 402 to the power 2", or "408 402 squared".
The square of 408 402 is 166 792 193 604 because 408 402 × 408 402 = 408 4022 = 166 792 193 604.
As a consequence, 408 402 is the square root of 166 792 193 604.
The multiples of 408 402 are all integers evenly divisible by 408 402, that is all numbers such that the remainder of the division by 408 402 is zero. There are infinitely many multiples of 408 402. The smallest multiples of 408 402 are: