It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 428 is not a prime number.
For example, 402 428 can be divided by 2: 402 428 / 2 = 201 214.
For 402 428 to be a prime number, it would have been required that 402 428 has only two divisors, i.e., itself and 1.
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402 428 is an even number, because it is evenly divisible by 2: 402 428 / 2 = 201 214.
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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 402 428 is about 634.372.
Thus, the square root of 402 428 is not an integer, and therefore 402 428 is not a square number.
The square of a number (here 402 428) is the result of the product of this number (402 428) by itself (i.e., 402 428 × 402 428); the square of 402 428 is sometimes called "raising 402 428 to the power 2", or "402 428 squared".
The square of 402 428 is 161 948 295 184 because 402 428 × 402 428 = 402 4282 = 161 948 295 184.
As a consequence, 402 428 is the square root of 161 948 295 184.
The multiples of 402 428 are all integers evenly divisible by 402 428, that is all numbers such that the remainder of the division by 402 428 is zero. There are infinitely many multiples of 402 428. The smallest multiples of 402 428 are: