It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 616 is not a prime number.
For example, 402 616 can be divided by 2: 402 616 / 2 = 201 308.
For 402 616 to be a prime number, it would have been required that 402 616 has only two divisors, i.e., itself and 1.
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402 616 is an even number, because it is evenly divisible by 2: 402 616 / 2 = 201 308.
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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 402 616 is about 634.520.
Thus, the square root of 402 616 is not an integer, and therefore 402 616 is not a square number.
The square of a number (here 402 616) is the result of the product of this number (402 616) by itself (i.e., 402 616 × 402 616); the square of 402 616 is sometimes called "raising 402 616 to the power 2", or "402 616 squared".
The square of 402 616 is 162 099 643 456 because 402 616 × 402 616 = 402 6162 = 162 099 643 456.
As a consequence, 402 616 is the square root of 162 099 643 456.
The multiples of 402 616 are all integers evenly divisible by 402 616, that is all numbers such that the remainder of the division by 402 616 is zero. There are infinitely many multiples of 402 616. The smallest multiples of 402 616 are: