It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 474 is not a prime number.
For example, 402 474 can be divided by 2: 402 474 / 2 = 201 237.
For 402 474 to be a prime number, it would have been required that 402 474 has only two divisors, i.e., itself and 1.
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402 474 is an even number, because it is evenly divisible by 2: 402 474 / 2 = 201 237.
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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 402 474 is about 634.408.
Thus, the square root of 402 474 is not an integer, and therefore 402 474 is not a square number.
The square of a number (here 402 474) is the result of the product of this number (402 474) by itself (i.e., 402 474 × 402 474); the square of 402 474 is sometimes called "raising 402 474 to the power 2", or "402 474 squared".
The square of 402 474 is 161 985 320 676 because 402 474 × 402 474 = 402 4742 = 161 985 320 676.
As a consequence, 402 474 is the square root of 161 985 320 676.
The multiples of 402 474 are all integers evenly divisible by 402 474, that is all numbers such that the remainder of the division by 402 474 is zero. There are infinitely many multiples of 402 474. The smallest multiples of 402 474 are: