It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 541 564 is not a prime number.
For example, 402 541 564 can be divided by 2: 402 541 564 / 2 = 201 270 782.
For 402 541 564 to be a prime number, it would have been required that 402 541 564 has only two divisors, i.e., itself and 1.
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402 541 564 is an even number, because it is evenly divisible by 2: 402 541 564 / 2 = 201 270 782.
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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 402 541 564 is about 20 063.438.
Thus, the square root of 402 541 564 is not an integer, and therefore 402 541 564 is not a square number.
The square of a number (here 402 541 564) is the result of the product of this number (402 541 564) by itself (i.e., 402 541 564 × 402 541 564); the square of 402 541 564 is sometimes called "raising 402 541 564 to the power 2", or "402 541 564 squared".
The square of 402 541 564 is 162 039 710 747 566 080 because 402 541 564 × 402 541 564 = 402 541 5642 = 162 039 710 747 566 080.
As a consequence, 402 541 564 is the square root of 162 039 710 747 566 080.
402 541 564 is a number with 9 digits.
The multiples of 402 541 564 are all integers evenly divisible by 402 541 564, that is all numbers such that the remainder of the division by 402 541 564 is zero. There are infinitely many multiples of 402 541 564. The smallest multiples of 402 541 564 are: