It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 644 is not a prime number.
For example, 402 644 can be divided by 2: 402 644 / 2 = 201 322.
For 402 644 to be a prime number, it would have been required that 402 644 has only two divisors, i.e., itself and 1.
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402 644 is an even number, because it is evenly divisible by 2: 402 644 / 2 = 201 322.
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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 402 644 is about 634.542.
Thus, the square root of 402 644 is not an integer, and therefore 402 644 is not a square number.
The square of a number (here 402 644) is the result of the product of this number (402 644) by itself (i.e., 402 644 × 402 644); the square of 402 644 is sometimes called "raising 402 644 to the power 2", or "402 644 squared".
The square of 402 644 is 162 122 190 736 because 402 644 × 402 644 = 402 6442 = 162 122 190 736.
As a consequence, 402 644 is the square root of 162 122 190 736.
The multiples of 402 644 are all integers evenly divisible by 402 644, that is all numbers such that the remainder of the division by 402 644 is zero. There are infinitely many multiples of 402 644. The smallest multiples of 402 644 are: