It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 708 is not a prime number.
For example, 402 708 can be divided by 2: 402 708 / 2 = 201 354.
For 402 708 to be a prime number, it would have been required that 402 708 has only two divisors, i.e., itself and 1.
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402 708 is an even number, because it is evenly divisible by 2: 402 708 / 2 = 201 354.
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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 402 708 is about 634.593.
Thus, the square root of 402 708 is not an integer, and therefore 402 708 is not a square number.
The square of a number (here 402 708) is the result of the product of this number (402 708) by itself (i.e., 402 708 × 402 708); the square of 402 708 is sometimes called "raising 402 708 to the power 2", or "402 708 squared".
The square of 402 708 is 162 173 733 264 because 402 708 × 402 708 = 402 7082 = 162 173 733 264.
As a consequence, 402 708 is the square root of 162 173 733 264.
The multiples of 402 708 are all integers evenly divisible by 402 708, that is all numbers such that the remainder of the division by 402 708 is zero. There are infinitely many multiples of 402 708. The smallest multiples of 402 708 are: