It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 401 902 is not a prime number.
For example, 402 401 902 can be divided by 2: 402 401 902 / 2 = 201 200 951.
For 402 401 902 to be a prime number, it would have been required that 402 401 902 has only two divisors, i.e., itself and 1.
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402 401 902 is an even number, because it is evenly divisible by 2: 402 401 902 / 2 = 201 200 951.
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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 402 401 902 is about 20 059.958.
Thus, the square root of 402 401 902 is not an integer, and therefore 402 401 902 is not a square number.
The square of a number (here 402 401 902) is the result of the product of this number (402 401 902) by itself (i.e., 402 401 902 × 402 401 902); the square of 402 401 902 is sometimes called "raising 402 401 902 to the power 2", or "402 401 902 squared".
The square of 402 401 902 is 161 927 290 733 217 600 because 402 401 902 × 402 401 902 = 402 401 9022 = 161 927 290 733 217 600.
As a consequence, 402 401 902 is the square root of 161 927 290 733 217 600.
402 401 902 is a number with 9 digits.
The multiples of 402 401 902 are all integers evenly divisible by 402 401 902, that is all numbers such that the remainder of the division by 402 401 902 is zero. There are infinitely many multiples of 402 401 902. The smallest multiples of 402 401 902 are: