It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 442 is not a prime number.
For example, 402 442 can be divided by 2: 402 442 / 2 = 201 221.
For 402 442 to be a prime number, it would have been required that 402 442 has only two divisors, i.e., itself and 1.
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402 442 is an even number, because it is evenly divisible by 2: 402 442 / 2 = 201 221.
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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 402 442 is about 634.383.
Thus, the square root of 402 442 is not an integer, and therefore 402 442 is not a square number.
The square of a number (here 402 442) is the result of the product of this number (402 442) by itself (i.e., 402 442 × 402 442); the square of 402 442 is sometimes called "raising 402 442 to the power 2", or "402 442 squared".
The square of 402 442 is 161 959 563 364 because 402 442 × 402 442 = 402 4422 = 161 959 563 364.
As a consequence, 402 442 is the square root of 161 959 563 364.
The multiples of 402 442 are all integers evenly divisible by 402 442, that is all numbers such that the remainder of the division by 402 442 is zero. There are infinitely many multiples of 402 442. The smallest multiples of 402 442 are: