1015. Smallest Integer Divisible by K 

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class Solution {
    public int smallestRepunitDivByK(int k) {
        if (k % 2 == 0 || k % 5 == 0) {
            return -1;
        }

        int temp = 1;
        int count = 1;

        while (temp % k != 0) {
            temp = temp % k;
            temp = temp * 10 + 1;
            count++;
        }

        return count;
    }
}

References

1015. Smallest Integer Divisible by K