It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 013 is not a prime number.
For example, 402 013 can be divided by 89: 402 013 / 89 = 4 517.
For 402 013 to be a prime number, it would have been required that 402 013 has only two divisors, i.e., itself and 1.
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402 013 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 402 013 is about 634.045.
Thus, the square root of 402 013 is not an integer, and therefore 402 013 is not a square number.
The square of a number (here 402 013) is the result of the product of this number (402 013) by itself (i.e., 402 013 × 402 013); the square of 402 013 is sometimes called "raising 402 013 to the power 2", or "402 013 squared".
The square of 402 013 is 161 614 452 169 because 402 013 × 402 013 = 402 0132 = 161 614 452 169.
As a consequence, 402 013 is the square root of 161 614 452 169.
The multiples of 402 013 are all integers evenly divisible by 402 013, that is all numbers such that the remainder of the division by 402 013 is zero. There are infinitely many multiples of 402 013. The smallest multiples of 402 013 are: