It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 401 is not a prime number.
For example, 402 401 can be divided by 19: 402 401 / 19 = 21 179.
For 402 401 to be a prime number, it would have been required that 402 401 has only two divisors, i.e., itself and 1.
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402 401 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 402 401 is about 634.351.
Thus, the square root of 402 401 is not an integer, and therefore 402 401 is not a square number.
The square of a number (here 402 401) is the result of the product of this number (402 401) by itself (i.e., 402 401 × 402 401); the square of 402 401 is sometimes called "raising 402 401 to the power 2", or "402 401 squared".
The square of 402 401 is 161 926 564 801 because 402 401 × 402 401 = 402 4012 = 161 926 564 801.
As a consequence, 402 401 is the square root of 161 926 564 801.
The multiples of 402 401 are all integers evenly divisible by 402 401, that is all numbers such that the remainder of the division by 402 401 is zero. There are infinitely many multiples of 402 401. The smallest multiples of 402 401 are: