It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 377 is not a prime number.
For example, 402 377 can be divided by 211: 402 377 / 211 = 1 907.
For 402 377 to be a prime number, it would have been required that 402 377 has only two divisors, i.e., itself and 1.
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402 377 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 402 377 is about 634.332.
Thus, the square root of 402 377 is not an integer, and therefore 402 377 is not a square number.
The square of a number (here 402 377) is the result of the product of this number (402 377) by itself (i.e., 402 377 × 402 377); the square of 402 377 is sometimes called "raising 402 377 to the power 2", or "402 377 squared".
The square of 402 377 is 161 907 250 129 because 402 377 × 402 377 = 402 3772 = 161 907 250 129.
As a consequence, 402 377 is the square root of 161 907 250 129.
The multiples of 402 377 are all integers evenly divisible by 402 377, that is all numbers such that the remainder of the division by 402 377 is zero. There are infinitely many multiples of 402 377. The smallest multiples of 402 377 are: