It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 542 is not a prime number.
For example, 402 542 can be divided by 2: 402 542 / 2 = 201 271.
For 402 542 to be a prime number, it would have been required that 402 542 has only two divisors, i.e., itself and 1.
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402 542 is an even number, because it is evenly divisible by 2: 402 542 / 2 = 201 271.
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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 402 542 is about 634.462.
Thus, the square root of 402 542 is not an integer, and therefore 402 542 is not a square number.
The square of a number (here 402 542) is the result of the product of this number (402 542) by itself (i.e., 402 542 × 402 542); the square of 402 542 is sometimes called "raising 402 542 to the power 2", or "402 542 squared".
The square of 402 542 is 162 040 061 764 because 402 542 × 402 542 = 402 5422 = 162 040 061 764.
As a consequence, 402 542 is the square root of 162 040 061 764.
The multiples of 402 542 are all integers evenly divisible by 402 542, that is all numbers such that the remainder of the division by 402 542 is zero. There are infinitely many multiples of 402 542. The smallest multiples of 402 542 are: