It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 604 023 is not a prime number.
For example, 402 604 023 can be divided by 3: 402 604 023 / 3 = 134 201 341.
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For 402 604 023 to be a prime number, it would have been required that 402 604 023 has only two divisors, i.e., itself and 1.
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402 604 023 is an odd number, because it is not evenly divisible by 2.
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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 402 604 023 is about 20 064.995.
Thus, the square root of 402 604 023 is not an integer, and therefore 402 604 023 is not a square number.
The square of a number (here 402 604 023) is the result of the product of this number (402 604 023) by itself (i.e., 402 604 023 × 402 604 023); the square of 402 604 023 is sometimes called "raising 402 604 023 to the power 2", or "402 604 023 squared".
The square of 402 604 023 is 162 089 999 335 784 544 because 402 604 023 × 402 604 023 = 402 604 0232 = 162 089 999 335 784 544.
As a consequence, 402 604 023 is the square root of 162 089 999 335 784 544.
402 604 023 is a number with 9 digits.
The multiples of 402 604 023 are all integers evenly divisible by 402 604 023, that is all numbers such that the remainder of the division by 402 604 023 is zero. There are infinitely many multiples of 402 604 023. The smallest multiples of 402 604 023 are: