It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 499 is not a prime number.
For example, 402 499 can be divided by 71: 402 499 / 71 = 5 669.
For 402 499 to be a prime number, it would have been required that 402 499 has only two divisors, i.e., itself and 1.
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402 499 is an odd number, because it is not evenly divisible by 2.
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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 402 499 is about 634.428.
Thus, the square root of 402 499 is not an integer, and therefore 402 499 is not a square number.
The square of a number (here 402 499) is the result of the product of this number (402 499) by itself (i.e., 402 499 × 402 499); the square of 402 499 is sometimes called "raising 402 499 to the power 2", or "402 499 squared".
The square of 402 499 is 162 005 445 001 because 402 499 × 402 499 = 402 4992 = 162 005 445 001.
As a consequence, 402 499 is the square root of 162 005 445 001.
The multiples of 402 499 are all integers evenly divisible by 402 499, that is all numbers such that the remainder of the division by 402 499 is zero. There are infinitely many multiples of 402 499. The smallest multiples of 402 499 are: